G.f.: Sum_{n>=0} x^n/(1-x)^(5*n) * Sum_{k=0..n} C(n,k)^2 * x^k.
A249793
G.f.: Sum_{n>=0} x^n/(1-x)^(5*n) * Sum_{k=0..n} C(n,k)^2 * x^k.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =35a(4) =171a(5) =856a(6) =4359a(7) =22446a(8) =116557a(9) =609289a(10) =3202088a(11) =16902558a(12) =89550391a(13) =475922764a(14) =2536113322a(15) =13545996260a(16) =72500109601a(17) =388730700761
External references
- oeis: A249793