A diagonal of triangle A185755.

A185758

A diagonal of triangle A185755.

Terms

    a(0) =2a(1) =15a(2) =120a(3) =1190a(4) =14595a(5) =215950a(6) =3761310a(7) =75550188a(8) =1721103648a(9) =43872089118

External references