a(n) = Sum_{k = 0..n} binomial(n, k)^2*binomial(n+k, k)^2*A108625(n, n-k).

A376464

a(n) = Sum_{k = 0..n} binomial(n, k)^2*binomial(n+k, k)^2*A108625(n, n-k).

Terms

    a(0) =1a(1) =7a(2) =307a(3) =20167a(4) =1667251a(5) =157682257a(6) =16284029959

External references