a(n) = (12*n + 11)^2.

Terms

a(0) =121a(1) =529a(2) =1225a(3) =2209a(4) =3481a(5) =5041a(6) =6889a(7) =9025a(8) =11449a(9) =14161a(10) =17161a(11) =20449a(12) =24025a(13) =27889a(14) =32041a(15) =36481a(16) =41209a(17) =46225a(18) =51529a(19) =57121a(20) =63001a(21) =69169a(22) =75625a(23) =82369a(24) =89401a(25) =96721a(26) =104329a(27) =112225a(28) =120409a(29) =128881