Expansion of (g/(1 - x*g))^2, where g = 1+x*g^4 is the g.f. of A002293.
A391275
Expansion of (g/(1 - x*g))^2, where g = 1+x*g^4 is the g.f. of A002293.
Terms
- a(0) =1a(1) =4a(2) =18a(3) =98a(4) =613a(5) =4194a(6) =30439a(7) =230170a(8) =1793544a(9) =14300006a(10) =116096536a(11) =956454690a(12) =7975675367a(13) =67187754040a(14) =570926950419
External references
- oeis: A391275