a(n) = binomial(n^2, n+1)/(n-1).

A177788

a(n) = binomial(n^2, n+1)/(n-1).

Terms

    a(0) =4a(1) =63a(2) =1456a(3) =44275a(4) =1669536a(5) =75163011a(6) =3934369216a(7) =234799050915

External references