G.f. A(x) satisfies A(A(A(x))) = Sum_{k>=1} k^2 * 9^(k-1) * x^k.
A372500
G.f. A(x) satisfies A(A(A(x))) = Sum_{k>=1} k^2 * 9^(k-1) * x^k.
Terms
- a(0) =0a(1) =1a(2) =12a(3) =-45a(4) =1404a(5) =-33048a(6) =684288a(7) =-5847309a(8) =-440129376a(9) =30809872071a(10) =-952939532952
External references
- oeis: A372500