Expansion of g^2/(1 + x^2*g^2), where g = 1+x*g^4 is the g.f. of A002293.
A391455
Expansion of g^2/(1 + x^2*g^2), where g = 1+x*g^4 is the g.f. of A002293.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =48a(4) =319a(5) =2260a(6) =16779a(7) =128900a(8) =1016128a(9) =8173562a(10) =66821750a(11) =553612116a(12) =4637917939a(13) =39222516270a(14) =334397941985
External references
- oeis: A391455