E.g.f. A(x) satisfies A(x) = 1 + 3 * x * A(exp(x) - 1).

A355101

E.g.f. A(x) satisfies A(x) = 1 + 3 * x * A(exp(x) - 1).

Terms

    a(0) =1a(1) =3a(2) =18a(3) =189a(4) =2952a(5) =63225a(6) =1759374a(7) =61261200a(8) =2595618720a(9) =130963993263

External references