A037105 Trajectory of 3 under map n->15n+1 if n odd, n->n/2 if n even

3, 46, 23, 346, 173, 2596, 1298, 649, 9736, 4868, 2434, 1217, 18256, 9128, 4564, 2282, 1141, 17116, 8558, 4279, 64186, 32093, 481396, 240698, 120349, 1805236, 902618, 451309, 6769636, 3384818, 1692409