a(n) = (11*n)^6.

Terms

a(0) =0a(1) =1771561a(2) =113379904a(3) =1291467969a(4) =7256313856a(5) =27680640625a(6) =82653950016a(7) =208422380089a(8) =464404086784a(9) =941480149401