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

Terms

a(0) =0a(1) =5a(2) =16a(3) =39a(4) =80a(5) =145a(6) =240a(7) =371a(8) =544a(9) =765a(10) =1040a(11) =1375a(12) =1776a(13) =2249a(14) =2800a(15) =3435a(16) =4160a(17) =4981a(18) =5904a(19) =6935a(20) =8080a(21) =9345a(22) =10736a(23) =12259a(24) =13920a(25) =15725a(26) =17680a(27) =19791a(28) =22064a(29) =24505