G.f.: A(x) = 1 + x*(1 + x*(1 + x*(...(1 + x*(...)^(4n))...)^12)^8)^4.
A138214
G.f.: A(x) = 1 + x*(1 + x*(1 + x*(...(1 + x*(...)^(4n))...)^12)^8)^4.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =38a(4) =596a(5) =13137a(6) =373544a(7) =13008184a(8) =535947320a(9) =25492727304
External references
- oeis: A138214