E.g.f: Sum_{n>=0} 2^(n(n-1)) * exp(2^n*x) * x^n/n!.

A165327

E.g.f: Sum_{n>=0} 2^(n(n-1)) * exp(2^n*x) * x^n/n!.

Terms

    a(0) =1a(1) =2a(2) =9a(3) =125a(4) =6561a(5) =1419857a(6) =1291467969

External references