Column 1 of triangle A126450; a(n) = C( C(n+3,3), n).

A126452

Column 1 of triangle A126450; a(n) = C( C(n+3,3), n).

Terms

    a(0) =1a(1) =4a(2) =45a(3) =1140a(4) =52360a(5) =3819816a(6) =406481544a(7) =59487568920

External references