G.f.: A(x) = 1+x*(1+x*(1+x*(...(1+x*(...)^(2^n) )...)^8)^4)^2.
A120959
G.f.: A(x) = 1+x*(1+x*(1+x*(...(1+x*(...)^(2^n) )...)^8)^4)^2.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =9a(4) =84a(5) =1540a(6) =54522a(7) =3734454a(8) =498851832a(9) =131025111932
External references
- oeis: A120959