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

Terms

a(0) =1a(1) =11a(2) =35a(3) =79a(4) =149a(5) =251a(6) =391a(7) =575a(8) =809a(9) =1099a(10) =1451a(11) =1871a(12) =2365a(13) =2939a(14) =3599a(15) =4351a(16) =5201a(17) =6155a(18) =7219a(19) =8399a(20) =9701a(21) =11131a(22) =12695a(23) =14399a(24) =16249a(25) =18251a(26) =20411a(27) =22735a(28) =25229a(29) =27899