a(n) = 4*n^2 + 3*n + 2.

Terms

a(0) =2a(1) =9a(2) =24a(3) =47a(4) =78a(5) =117a(6) =164a(7) =219a(8) =282a(9) =353a(10) =432a(11) =519a(12) =614a(13) =717a(14) =828a(15) =947a(16) =1074a(17) =1209a(18) =1352a(19) =1503a(20) =1662a(21) =1829a(22) =2004a(23) =2187a(24) =2378a(25) =2577a(26) =2784a(27) =2999a(28) =3222a(29) =3453