User blog comment:Alemagno12/Brain-Flak Challenge/@comment-2604:6000:111D:1739:A1B6:DE3A:489:82EA-20180920195317/@comment-2604:6000:111D:1739:A1B6:DE3A:489:82EA-20180920202053

Flak(24) can be even higher:

(((((((((())))))))))

is a little more than 2^^10. It can be computed precisely with the following Haskell

t x = x^2 - x   n 0 _ = 0 n a b = t b + n (a-1) (b * 2 ^ b)   main = print $ 2 + n 10 2

Flak(25) and Flak(26) are greater than 2 + n 11 2 and 2 + n 12 2 respectively.