A033974 Trajectory of 1 under map n->37n+1 if n odd, n->n/2 if n even

1, 38, 19, 704, 352, 176, 88, 44, 22, 11, 408, 204, 102, 51, 1888, 944, 472, 236, 118, 59, 2184, 1092, 546, 273, 10102, 5051, 186888, 93444, 46722, 23361, 864358, 432179, 15990624, 7995312, 3997656, 1998828