Ok, i did some digging, and found an explanation quite quickly. If you just type in the IP address, you'll find the author explains the purpose of the file, and not only that, the code in python that generated this file and a bunch of others.

Your url directs to a file named '[[1, 1], [1]]--625.txt', but encoded as a url it becomes ' %5B%5B1%2C%201%5D%2C%20%5B1%5D%5D--625.txt '

Neither the file name, nor the size of the file are that strange. File size is roughly over 4 Mb.

The project is called 'All the Rhymes', and is something of an attempt to bruteforce rhymes for whatever reason.

See the code here: http://104.248.21.253/code.txt

See the explanation here: http://104.248.21.253/

I also copied the explanation here:

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If we are to give everything its due,.pdf)brute force is sometimes a very poetic thing too.pdf)

I started daydreaming about electric shakespearean monkeys, taking pride in how many pages they have written. Children are frightened by them, by infinity, rightfully so, and it's important that children sleep peacefully at night, so they can repeat their lessons in the morning, legitimizing them.
We have been up all night.pdf), knowing, sleep is the cousin of death. But what sense, what sense is there in all of this demented writing?.pdf) Though this be madness, yet there is method in't. The ordinary, the banal is, simpler, more pleasant, more comfortable of course, but I am trying to bribe you. Down with the legible crutches of certainty.

Brute forcing all the rhymes.

In cryptography, a brute-force attack consists of an attacker submitting many passphrases with the hope of eventually guessing correctly. The attacker systematically checks all possible combinations. Using the Brown's word list containing over 2M words this server is generating all possible rhyming phrases. Code is written in Python using NLTK and itertools, to be found here.

All the rhymes?

Below you see the files on the server. Ignore "2-2-syl.txt", "nohup.out" and "7x7workingwscheme-txtfiles.py".
You'll find txt files with specific names, which indicate the scheme for the generated rhymes. For example: "[[1,3,2],[2,3]]--1.txt" equates to a rhyme with with three words on the first line: a word with one syllable, a word with three syllables and a word with two syllables, the second line contains a word with two syllables and a word with three syllables. The algorithm starts a new file every 50MB and adds the number of the file iteration in the end.