a(n) = n*(n^2 - 3*n + 10)*2^(n-4).

Terms

a(0) =0a(1) =1a(2) =4a(3) =15a(4) =56a(5) =200a(6) =672a(7) =2128a(8) =6400a(9) =18432a(10) =51200a(11) =137984a(12) =362496a(13) =931840a(14) =2351104a(15) =5836800a(16) =14286848a(17) =34537472a(18) =82575360a(19) =195493888a(20) =458752000a(21) =1067974656a(22) =2468347904a(23) =5667553280a(24) =12935233536a(25) =29360128000a(26) =66303557632a(27) =149032009728a(28) =333531054080a(29) =743431995392