a(n) = Sum_{k = 0..n} (-1)^(n+k)*k*binomial(n,k)*binomial(n+k,k)^2.

A357558

a(n) = Sum_{k = 0..n} (-1)^(n+k)*k*binomial(n,k)*binomial(n+k,k)^2.

Terms

    a(0) =0a(1) =4a(2) =54a(3) =648a(4) =7500a(5) =85440a(6) =965202a(7) =10849552a(8) =121566744a(9) =1359160020a(10) =15172321890a(11) =169175039616

External references