a(n) = n^4 + n^3 + n^2.

Terms

a(0) =0a(1) =3a(2) =28a(3) =117a(4) =336a(5) =775a(6) =1548a(7) =2793a(8) =4672a(9) =7371a(10) =11100a(11) =16093a(12) =22608a(13) =30927a(14) =41356a(15) =54225a(16) =69888a(17) =88723a(18) =111132a(19) =137541a(20) =168400a(21) =204183a(22) =245388a(23) =292537a(24) =346176a(25) =406875a(26) =475228a(27) =551853a(28) =637392a(29) =732511