a(n) = 24*n^2 + 1.

Terms

a(0) =1a(1) =25a(2) =97a(3) =217a(4) =385a(5) =601a(6) =865a(7) =1177a(8) =1537a(9) =1945a(10) =2401a(11) =2905a(12) =3457a(13) =4057a(14) =4705a(15) =5401a(16) =6145a(17) =6937a(18) =7777a(19) =8665a(20) =9601a(21) =10585a(22) =11617a(23) =12697a(24) =13825a(25) =15001a(26) =16225a(27) =17497a(28) =18817a(29) =20185