G.f.: B(x)*B(2*x^2)*B(3*x^3)*..., where B(x) is g.f. of A000312.
A326985
G.f.: B(x)*B(2*x^2)*B(3*x^3)*..., where B(x) is g.f. of A000312.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =32a(4) =287a(5) =3222a(6) =47606a(7) =831488a(8) =16890792a(9) =389286222a(10) =10037183606a(11) =286154919078
External references
- oeis: A326985