G.f: A(x) = exp(Sum_{n>=1} A(L(n)*x)^n*x^n/n) = exp(Sum_{n>=1} L(n)*x^n/n) where L(n) = A180721(n).
A180720
G.f: A(x) = exp(Sum_{n>=1} A(L(n)*x)^n*x^n/n) = exp(Sum_{n>=1} L(n)*x^n/n) where L(n) = A180721(n).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =53a(5) =1305a(6) =177559a(7) =247880897
External references
- oeis: A180720