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

Terms

a(0) =4a(1) =48a(2) =288a(3) =1280a(4) =4800a(5) =16128a(6) =50176a(7) =147456a(8) =414720a(9) =1126400a(10) =2973696a(11) =7667712a(12) =19382272a(13) =48168960a(14) =117964800a(15) =285212672a(16) =681836544a(17) =1613758464a(18) =3785359360a(19) =8808038400a(20) =20346568704a(21) =46690992128a(22) =106501767168a(23) =241591910400