Seventh column of triangle A067417.

A067422

Seventh column of triangle A067417.

Terms

    a(0) =1a(1) =9a(2) =189a(3) =3969a(4) =83349a(5) =1750329a(6) =36756909a(7) =771895089a(8) =16209796869a(9) =340405734249

External references