G.f.: 1 / (1 + 12*x*G(x)^2 - 13*x*G(x)^3) where G(x) = 1 + x*G(x)^4 is the g.f. of A002293.

A226761

G.f.: 1 / (1 + 12*x*G(x)^2 - 13*x*G(x)^3) where G(x) = 1 + x*G(x)^4 is the g.f. of A002293.

Terms

    a(0) =1a(1) =1a(2) =16a(3) =118a(4) =1004a(5) =8601a(6) =75076a(7) =662796a(8) =5903676a(9) =52949332a(10) =477533356a(11) =4326309406a(12) =39343725716a(13) =358943047438

External references