G.f.: A(x) = 1+x*(1+2x*(1+3x*(...(1+n*x*(...)^3)^3...)^3)^3)^3.
A128319
G.f.: A(x) = 1+x*(1+2x*(1+3x*(...(1+n*x*(...)^3)^3...)^3)^3)^3.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =66a(4) =1034a(5) =20790a(6) =507600a(7) =14546196a(8) =478095264a(9) =17722127700a(10) =731393039376
External references
- oeis: A128319