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

Terms

a(0) =0a(1) =16a(2) =144a(3) =768a(4) =3200a(5) =11520a(6) =37632a(7) =114688a(8) =331776a(9) =921600a(10) =2478080a(11) =6488064a(12) =16613376a(13) =41746432a(14) =103219200a(15) =251658240a(16) =606076928a(17) =1443889152a(18) =3406823424a(19) =7969177600a(20) =18496880640a(21) =42630905856a(22) =97626619904a(23) =222264557568