Truncated hex numbers: a(n) = 24*n^2 + 6*n + 1.

Terms

a(0) =1a(1) =31a(2) =109a(3) =235a(4) =409a(5) =631a(6) =901a(7) =1219a(8) =1585a(9) =1999a(10) =2461a(11) =2971a(12) =3529a(13) =4135a(14) =4789a(15) =5491a(16) =6241a(17) =7039a(18) =7885a(19) =8779a(20) =9721a(21) =10711a(22) =11749a(23) =12835a(24) =13969a(25) =15151a(26) =16381a(27) =17659a(28) =18985a(29) =20359