a(n) = 12*n^2 + 1.

Terms

a(0) =1a(1) =13a(2) =49a(3) =109a(4) =193a(5) =301a(6) =433a(7) =589a(8) =769a(9) =973a(10) =1201a(11) =1453a(12) =1729a(13) =2029a(14) =2353a(15) =2701a(16) =3073a(17) =3469a(18) =3889a(19) =4333a(20) =4801a(21) =5293a(22) =5809a(23) =6349a(24) =6913a(25) =7501a(26) =8113a(27) =8749a(28) =9409a(29) =10093