a(n) = 12*n^2 + 18*n + 7.

Terms

a(0) =7a(1) =37a(2) =91a(3) =169a(4) =271a(5) =397a(6) =547a(7) =721a(8) =919a(9) =1141a(10) =1387a(11) =1657a(12) =1951a(13) =2269a(14) =2611a(15) =2977a(16) =3367a(17) =3781a(18) =4219a(19) =4681a(20) =5167a(21) =5677a(22) =6211a(23) =6769a(24) =7351a(25) =7957a(26) =8587a(27) =9241a(28) =9919a(29) =10621