L.g.f: A(x) = Sum_{n>=1} a(n)*x^n/n = Sum_{n>=1} E( a(n)*x )^n*x^n/n where E(x) = exp(A(x)) is the g.f. of A180720.
A180721
L.g.f: A(x) = Sum_{n>=1} a(n)*x^n/n = Sum_{n>=1} E( a(n)*x )^n*x^n/n where E(x) = exp(A(x)) is the g.f. of A180720.
Terms
- a(0) =1a(1) =3a(2) =16a(3) =183a(4) =6236a(5) =1057176a(6) =1733913028
External references
- oeis: A180721