Coefficient of x^n in the expansion of ( (1+x)^2 / (1-x^3)^2 )^n.
A370215
Coefficient of x^n in the expansion of ( (1+x)^2 / (1-x^3)^2 )^n.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =26a(4) =134a(5) =702a(6) =3642a(7) =18916a(8) =99078a(9) =523448a(10) =2783406a(11) =14870418a(12) =79743002a(13) =428987236a(14) =2314194840a(15) =12514276476a(16) =67815709958a(17) =368183248722
External references
- oeis: A370215