a(n) = n*(n-1)*2^n.

Terms

a(0) =0a(1) =0a(2) =8a(3) =48a(4) =192a(5) =640a(6) =1920a(7) =5376a(8) =14336a(9) =36864a(10) =92160a(11) =225280a(12) =540672a(13) =1277952a(14) =2981888a(15) =6881280a(16) =15728640a(17) =35651584a(18) =80216064a(19) =179306496a(20) =398458880a(21) =880803840a(22) =1937768448a(23) =4244635648a(24) =9261023232a(25) =20132659200a(26) =43620761600a(27) =94220845056a(28) =202937204736a(29) =435939180544