451725domain: NAppears in sequencesTriangular numbers composed of only digits with line segments or both line segments and curves {1, 2, 4, 5, 7}.at n=37A247021Number of 4 X n 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=9A302083