a(n) = 2*n^2 + n - 7.

Terms

a(0) =-7a(1) =-4a(2) =3a(3) =14a(4) =29a(5) =48a(6) =71a(7) =98a(8) =129a(9) =164a(10) =203a(11) =246a(12) =293a(13) =344a(14) =399a(15) =458a(16) =521a(17) =588a(18) =659a(19) =734a(20) =813a(21) =896a(22) =983a(23) =1074a(24) =1169a(25) =1268a(26) =1371a(27) =1478a(28) =1589a(29) =1704