Column 4 of triangle A141760.

A141764

Column 4 of triangle A141760.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =36a(4) =336a(5) =3863a(6) =52944a(7) =844777a(8) =15411547a(9) =316888806a(10) =7258887646a(11) =183464090374

External references