G.f.: Sum_{n>=0} x^n / (1-4*x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * 4^k * x^k].
A248055
G.f.: Sum_{n>=0} x^n / (1-4*x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * 4^k * x^k].
Terms
- a(0) =1a(1) =5a(2) =34a(3) =265a(4) =2219a(5) =19490a(6) =177119a(7) =1651405a(8) =15707416a(9) =151791375a(10) =1485814989a(11) =14697965770a(12) =146673432721
External references
- oeis: A248055