a(n) = [x^n] 1 + x*(1 + 2*x*(1 + 3*x*(1 + 4*x*(1 + 5*x*(1 + ...)^n)^n)^n)^n)^n.
A302657
a(n) = [x^n] 1 + x*(1 + 2*x*(1 + 3*x*(1 + 4*x*(1 + 5*x*(1 + ...)^n)^n)^n)^n)^n.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =66a(4) =2576a(5) =181580a(6) =20040132a(7) =3176873014a(8) =683004260416
External references
- oeis: A302657