G.f.: Sum_{n>=0} (3 + (1+x)^n)^n / (4 + (1+x)^n)^(n+1).
A302615
G.f.: Sum_{n>=0} (3 + (1+x)^n)^n / (4 + (1+x)^n)^(n+1).
Terms
- a(0) =1a(1) =1a(2) =10a(3) =130a(4) =2390a(5) =56714a(6) =1644138a(7) =56327820a(8) =2226708772a(9) =99761490536
External references
- oeis: A302615