E.g.f.: exp(4*x*G(x)^3) / G(x)^3 where G(x) = 1 + x*G(x)^4 is the g.f. of A002293.
A251574
E.g.f.: exp(4*x*G(x)^3) / G(x)^3 where G(x) = 1 + x*G(x)^4 is the g.f. of A002293.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =40a(4) =712a(5) =18784a(6) =663424a(7) =29480896a(8) =1581976960a(9) =99585422848
External references
- oeis: A251574