a(n) = 169*n^2 - 13.

Terms

a(0) =156a(1) =663a(2) =1508a(3) =2691a(4) =4212a(5) =6071a(6) =8268a(7) =10803a(8) =13676a(9) =16887a(10) =20436a(11) =24323a(12) =28548a(13) =33111a(14) =38012a(15) =43251a(16) =48828a(17) =54743a(18) =60996a(19) =67587a(20) =74516a(21) =81783a(22) =89388a(23) =97331a(24) =105612a(25) =114231a(26) =123188a(27) =132483a(28) =142116a(29) =152087