a(n) = 8^n * n*(n+1).

Terms

a(0) =0a(1) =16a(2) =384a(3) =6144a(4) =81920a(5) =983040a(6) =11010048a(7) =117440512a(8) =1207959552a(9) =12079595520a(10) =118111600640