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

Terms

a(0) =1a(1) =1a(2) =5a(3) =19a(4) =49a(5) =101a(6) =181a(7) =295a(8) =449a(9) =649a(10) =901a(11) =1211a(12) =1585a(13) =2029a(14) =2549a(15) =3151a(16) =3841a(17) =4625a(18) =5509a(19) =6499a(20) =7601a(21) =8821a(22) =10165a(23) =11639a(24) =13249a(25) =15001a(26) =16901a(27) =18955a(28) =21169a(29) =23549