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

Terms

a(0) =2a(1) =3a(2) =10a(3) =23a(4) =42a(5) =67a(6) =98a(7) =135a(8) =178a(9) =227a(10) =282a(11) =343a(12) =410a(13) =483a(14) =562a(15) =647a(16) =738a(17) =835a(18) =938a(19) =1047a(20) =1162a(21) =1283a(22) =1410a(23) =1543a(24) =1682a(25) =1827a(26) =1978a(27) =2135a(28) =2298a(29) =2467