a(n) = n*(n^3+n^2+2*n+1).

Terms

a(0) =0a(1) =5a(2) =34a(3) =129a(4) =356a(5) =805a(6) =1590a(7) =2849a(8) =4744a(9) =7461a(10) =11210a(11) =16225a(12) =22764a(13) =31109a(14) =41566a(15) =54465a(16) =70160a(17) =89029a(18) =111474a(19) =137921a(20) =168820a(21) =204645a(22) =245894a(23) =293089a(24) =346776a(25) =407525a(26) =475930a(27) =552609a(28) =638204a(29) =733381