a(n) = S2(n,2), where S2(n, t) = Sum_{k=0..n} k^t *(Sum_{j=0..k} binomial(n,j))^2.

A089665

a(n) = S2(n,2), 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) =73a(3) =788a(4) =6630a(5) =48120a(6) =316526a(7) =1940568a(8) =11284380a(9) =62968560a(10) =339954670a(11) =1786320184a(12) =9176663028a(13) =46248446608a(14) =229285525420

External references