G.f. A(x) satisfies A(x) = (1 + x*A(x)^2) * C(x*A(x)^3), where C(x) is the g.f. of A000108.
A381780
G.f. A(x) satisfies A(x) = (1 + x*A(x)^2) * C(x*A(x)^3), where C(x) is the g.f. of A000108.
Terms
- a(0) =1a(1) =2a(2) =13a(3) =122a(4) =1348a(5) =16317a(6) =209366a(7) =2797461a(8) =38509302a(9) =542367569a(10) =7778173646a(11) =113196865436
External references
- oeis: A381780