a(n) = Sum_{k=0..n} binomial(n*k,n+k).

A359842

a(n) = Sum_{k=0..n} binomial(n*k,n+k).

Terms

    a(0) =1a(1) =0a(2) =1a(3) =90a(4) =13690a(5) =3443275a(6) =1308315371a(7) =701623884514

External references