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

A383121

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

Terms

    a(0) =1a(1) =0a(2) =3a(3) =47a(4) =1093a(5) =33029a(6) =1236781a(7) =55325416a(8) =2879987209a(9) =171061709417

External references