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

A177784

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

Terms

    a(0) =1a(1) =7a(2) =91a(3) =1771a(4) =46376a(5) =1533939a(6) =61474519a(7) =2898753715a(8) =157366449604

External references