G.f.: A(x) = 1 + x*exp( Sum_{k>=1} [A(3^k*x) - 1]^k/k ).
A156908
G.f.: A(x) = 1 + x*exp( Sum_{k>=1} [A(3^k*x) - 1]^k/k ).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =72a(4) =10899a(5) =13775400a(6) =185126087574
External references
- oeis: A156908
A156908
G.f.: A(x) = 1 + x*exp( Sum_{k>=1} [A(3^k*x) - 1]^k/k ).