a(n) = S2(n,4), where S2(n, t) = Sum_{k=0..n} k^t *(Sum_{j=0..k} binomial(n,j))^2.
A089667
a(n) = S2(n,4), where S2(n, t) = Sum_{k=0..n} k^t *(Sum_{j=0..k} binomial(n,j))^2.
Terms
- a(0) =0a(1) =4a(2) =265a(3) =5984a(4) =85722a(5) =944904a(6) =8771462a(7) =72095520a(8) =541127988a(9) =3785356752a(10) =25032083230a(11) =158102986624a(12) =961123994220
External references
- oeis: A089667