a(n) = (12*n + 5)^2.

Terms

a(0) =25a(1) =289a(2) =841a(3) =1681a(4) =2809a(5) =4225a(6) =5929a(7) =7921a(8) =10201a(9) =12769a(10) =15625a(11) =18769a(12) =22201a(13) =25921a(14) =29929a(15) =34225a(16) =38809a(17) =43681a(18) =48841a(19) =54289a(20) =60025a(21) =66049a(22) =72361a(23) =78961a(24) =85849a(25) =93025a(26) =100489a(27) =108241a(28) =116281a(29) =124609