a(n) = n * (2^n - 8).

Terms

a(0) =0a(1) =-6a(2) =-8a(3) =0a(4) =32a(5) =120a(6) =336a(7) =840a(8) =1984a(9) =4536a(10) =10160a(11) =22440a(12) =49056a(13) =106392a(14) =229264a(15) =491400a(16) =1048448a(17) =2228088a(18) =4718448a(19) =9961320a(20) =20971360a(21) =44040024a(22) =92274512a(23) =192937800a(24) =402652992a(25) =838860600a(26) =1744830256a(27) =3623878440a(28) =7516192544a(29) =15569256216