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

Terms

a(0) =1a(1) =0a(2) =11a(3) =46a(4) =117a(5) =236a(6) =415a(7) =666a(8) =1001a(9) =1432a(10) =1971a(11) =2630a(12) =3421a(13) =4356a(14) =5447a(15) =6706a(16) =8145a(17) =9776a(18) =11611a(19) =13662a(20) =15941a(21) =18460a(22) =21231a(23) =24266a(24) =27577a(25) =31176a(26) =35075a(27) =39286a(28) =43821a(29) =48692