1, 5, 19, 73, 271, 993, 3643, 13309, 48655, 177805, 649699, 2374129, 8674999, 31698625, 115826659, 423229469, 1546477863, 5650815053, 20648028987, 75447710625, 275685244735, 1007351382097, 3680852748715, 13449802390397, 49145455249183, 179577045144493, 656172884958899, 2397649735785777