a(n) = n^5 - n^3 + n^2.

Terms

a(0) =0a(1) =1a(2) =28a(3) =225a(4) =976a(5) =3025a(6) =7596a(7) =16513a(8) =32320a(9) =58401a(10) =99100a(11) =159841a(12) =247248a(13) =369265a(14) =535276a(15) =756225a(16) =1044736a(17) =1415233a(18) =1884060a(19) =2469601a(20) =3192400a(21) =4075281a(22) =5143468a(23) =6424705a(24) =7949376a(25) =9750625a(26) =11864476a(27) =14329953a(28) =17189200a(29) =20487601