G.f. A(x) satisfies A(x) = (1 + x) * B(x*A(x)), where B(x) is the g.f. of A002293.

A381940

G.f. A(x) satisfies A(x) = (1 + x) * B(x*A(x)), where B(x) is the g.f. of A002293.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =51a(4) =440a(5) =4170a(6) =41921a(7) =438972a(8) =4736281a(9) =52286520a(10) =587774685a(11) =6705201456a(12) =77426676892a(13) =903251324476

External references