G.f.: Sum_{n>=0} x^n / (1-4*x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * 3^k * x^k] * [Sum_{k=0..n} C(n,k)^2 * 4^k * x^k].
A246510
G.f.: Sum_{n>=0} x^n / (1-4*x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * 3^k * x^k] * [Sum_{k=0..n} C(n,k)^2 * 4^k * x^k].
Terms
- a(0) =1a(1) =5a(2) =36a(3) =305a(4) =2821a(5) =27690a(6) =282699a(7) =2967285a(8) =31785786a(9) =345815975a(10) =3808549531a(11) =42360017130a(12) =474990254821
External references
- oeis: A246510