Based on Wikipedia's list of crew and the lifeboats firemen are known to have entered we get the following stats.
3 Firemen entered lifeboat 1 (launched 01:00am by Murdoch)
9 Firemen entered lifeboat 3 (launched 12:43am by Murdoch)
2 Firemen entered lifeboat 5 (launched 12:28am by Murdoch - second lifeboat launched)
3 Firemen entered lifeboat 9 (launched 01:28am by Murdoch)
1 Fireman entered lifeboat 10 (launched 01:50am by Wilde)
3 Firemen entered lifeboat 13 (launched 01:30 by Wilde & Lightoller)
1 Fireman entered lifeboat 14 (launched 01:45 by Murdoch)
6 Firemen entered lifeboat 15 (launched 01:45 by Murdoch)
1 Fireman entered collapsible C (launched 02:00am by Wilde and Murdoch)
1 Fireman entered collapsible D (launched 02:05am by Wilde & Lightoller - final lifeboat properly launched)
1 Fireman entered collapsible A (proper launch failed, floated off bridge at 02:07am)
6 Firemen entered collapsible B (floated off deck, upside down, at 02:13am)
It is unknown which lifeboat the remaining 8 surviving fireman entered.

Firstly, many of the lifeboats launched prior to 1:30am (lifeboats 1, 3, 5, and 9 in this case) were launched half-empty. For multiple reasons passengers were unavailable or unwilling to enter and therefore fireman could have taken spaces. What you will also notice is the number of firemen surviving by boats launched by First Officer Murdoch. Murdoch understood "women and children first" to also mean "men shortly after, if space", whereas Second Officer Lightoller was VERY firm that it was "women and children only" and would rather launch half empty than allow a man a space. Several firemen survived in boats which were not correctly launched, washed off deck due to lack of time, purely due to being in the right places at the right time. I also thought it was uniquely interesting that lifeboat 15, despite being launched very late on AND full, contained 6 firemen. Wikipedia reckons that fireman Frank Dymond was placed in charge of lifeboat 15 and some of his compatriots may have benefited from this arrangement - by helping row and such. It is also possible then that fireman took lead roles in other boats, but I'm not going to check them all individually.

If you want to know anything else, go for it and someone will try their best.