A037122 Trajectory of 3 under map n->49n+1 if n odd, n->n/2 if n even

3, 148, 74, 37, 1814, 907, 44444, 22222, 11111, 544440, 272220, 136110, 68055, 3334696, 1667348, 833674, 416837, 20425014, 10212507, 500412844, 250206422, 125103211, 6130057340, 3065028670, 1532514335