G.f. A(x) satisfies A(x) = (1 + x*A(x)) * C(x*A(x)^2), where C(x) is the g.f. of A000108.

A381778

G.f. A(x) satisfies A(x) = (1 + x*A(x)) * C(x*A(x)^2), where C(x) is the g.f. of A000108.

Terms

    a(0) =1a(1) =2a(2) =9a(3) =60a(4) =474a(5) =4105a(6) =37681a(7) =360122a(8) =3545320a(9) =35705553a(10) =366126614a(11) =3809497971a(12) =40119258081a(13) =426829897847

External references