G.f. A(x) satisfies A(x) = C(x*A(x)) / (1 - x)^2, where C(x) is the g.f. of A000108.
A381867
G.f. A(x) satisfies A(x) = C(x*A(x)) / (1 - x)^2, where C(x) is the g.f. of A000108.
Terms
- a(0) =1a(1) =3a(2) =10a(3) =44a(4) =239a(5) =1464a(6) =9610a(7) =65946a(8) =466951a(9) =3385259a(10) =24999475a(11) =187385168a(12) =1421901090a(13) =10901237530a(14) =84312106160a(15) =657031204068
External references
- oeis: A381867