a(n) = 38*n^2 + 1.

Terms

a(0) =1a(1) =39a(2) =153a(3) =343a(4) =609a(5) =951a(6) =1369a(7) =1863a(8) =2433a(9) =3079a(10) =3801a(11) =4599a(12) =5473a(13) =6423a(14) =7449a(15) =8551a(16) =9729a(17) =10983a(18) =12313a(19) =13719a(20) =15201a(21) =16759a(22) =18393a(23) =20103a(24) =21889a(25) =23751a(26) =25689a(27) =27703a(28) =29793a(29) =31959