A027677 When squared gives number composed of digits {1,4,6}.

1, 2, 4, 8, 12, 21, 38, 108, 119, 121, 129, 204, 408, 804, 2538, 3408, 6642, 12908, 25771, 78196, 81619, 333858, 204000408, 668164962, 813118358, 4018285038, 12006850738, 12694138988, 12706943631, 40182224262, 40578463021