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

Terms

a(0) =0a(1) =24a(2) =192a(3) =960a(4) =3840a(5) =13440a(6) =43008a(7) =129024a(8) =368640a(9) =1013760a(10) =2703360a(11) =7028736a(12) =17891328a(13) =44728320a(14) =110100480a(15) =267386880a(16) =641728512a(17) =1524105216a(18) =3586129920a(19) =8367636480a(20) =19377684480a(21) =44568674304a(22) =101871255552a(23) =231525580800a(24) =523449139200