a(n) = 10*n^2 + 4*n + 1.

Terms

a(0) =1a(1) =15a(2) =49a(3) =103a(4) =177a(5) =271a(6) =385a(7) =519a(8) =673a(9) =847a(10) =1041a(11) =1255a(12) =1489a(13) =1743a(14) =2017a(15) =2311a(16) =2625a(17) =2959a(18) =3313a(19) =3687a(20) =4081a(21) =4495a(22) =4929a(23) =5383a(24) =5857a(25) =6351a(26) =6865a(27) =7399a(28) =7953a(29) =8527