Third column of triangle A055864.

A055070

Third column of triangle A055864.

Terms

    a(0) =0a(1) =0a(2) =9a(3) =80a(4) =900a(5) =12348a(6) =200704a(7) =3779136a(8) =81000000a(9) =1948717100a(10) =52027785216

External references