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

Terms

a(0) =0a(1) =4a(2) =30a(3) =120a(4) =340a(5) =780a(6) =1554a(7) =2800a(8) =4680a(9) =7380a(10) =11110a(11) =16104a(12) =22620a(13) =30940a(14) =41370a(15) =54240a(16) =69904a(17) =88740a(18) =111150a(19) =137560a(20) =168420a(21) =204204a(22) =245410a(23) =292560a(24) =346200a(25) =406900a(26) =475254a(27) =551880a(28) =637420a(29) =732540