G.f.: Sum_{n>=0} x^n / (1-2*x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * 2^k * x^k].
A246455
G.f.: Sum_{n>=0} x^n / (1-2*x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * 2^k * x^k].
Terms
- a(0) =1a(1) =3a(2) =14a(3) =75a(4) =439a(5) =2718a(6) =17483a(7) =115575a(8) =779716a(9) =5342937a(10) =37065029a(11) =259694334a(12) =1834494025a(13) =13048232853a(14) =93352065596a(15) =671245767795
External references
- oeis: A246455