Column 0 of triangle A126457; a(n) = C( C(n+2,3) + 3, n).

A126458

Column 0 of triangle A126457; a(n) = C( C(n+2,3) + 3, n).

Terms

    a(0) =1a(1) =4a(2) =21a(3) =286a(4) =8855a(5) =501942a(6) =45057474a(7) =5843355957

External references