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

Terms

a(0) =4a(1) =169a(2) =576a(3) =1225a(4) =2116a(5) =3249a(6) =4624a(7) =6241a(8) =8100a(9) =10201a(10) =12544a(11) =15129a(12) =17956a(13) =21025a(14) =24336a(15) =27889a(16) =31684a(17) =35721a(18) =40000a(19) =44521a(20) =49284a(21) =54289a(22) =59536a(23) =65025a(24) =70756a(25) =76729a(26) =82944a(27) =89401a(28) =96100a(29) =103041