Column 0 of triangle A126454; a(n) = C( C(n+2,3) + 2, n).

A126455

Column 0 of triangle A126454; a(n) = C( C(n+2,3) + 2, n).

Terms

    a(0) =1a(1) =3a(2) =15a(3) =220a(4) =7315a(5) =435897a(6) =40475358a(7) =5373200880a(8) =962889794295

External references