Expansion of g^2/(1 - x*g^4), where g = 1+x*g^3 is the g.f. of A001764.
A391128
Expansion of g^2/(1 - x*g^4), where g = 1+x*g^3 is the g.f. of A001764.
Terms
- a(0) =1a(1) =3a(2) =14a(3) =74a(4) =415a(5) =2410a(6) =14323a(7) =86543a(8) =529462a(9) =3270870a(10) =20365398a(11) =127621431a(12) =804089754a(13) =5089649619a(14) =32344432715a(15) =206262067698
External references
- oeis: A391128