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

Terms

a(0) =1a(1) =-1a(2) =1a(3) =13a(4) =41a(5) =91a(6) =169a(7) =281a(8) =433a(9) =631a(10) =881a(11) =1189a(12) =1561a(13) =2003a(14) =2521a(15) =3121a(16) =3809a(17) =4591a(18) =5473a(19) =6461a(20) =7561a(21) =8779a(22) =10121a(23) =11593a(24) =13201a(25) =14951a(26) =16849a(27) =18901a(28) =21113a(29) =23491