a(n) = (n^3 - n^2)*7^n.

A128990

a(n) = (n^3 - n^2)*7^n.

Terms

    a(0) =0a(1) =196a(2) =6174a(3) =115248a(4) =1680700a(5) =21176820a(6) =242121642a(7) =2582630848a(8) =26149137336a(9) =254227724100

External references