User blog comment:Tachyonic Encrypter/The Hedera Function/@comment-1782812-20141029222007/@comment-4224897-20141030122138

Here lemme help you:

Define f(x) =

1 if x = 0

x!^f(x-1) otherwise

Then define g(x) =

1 if x = 0

f(x)*g(x-1) otherwise

Now define h(x) = x!(g(x))!

Done.