A037111 Trajectory of 3 under map n->27n+1 if n odd, n->n/2 if n even

3, 82, 41, 1108, 554, 277, 7480, 3740, 1870, 935, 25246, 12623, 340822, 170411, 4601098, 2300549, 62114824, 31057412, 15528706, 7764353, 209637532, 104818766, 52409383, 1415053342, 707526671, 19103220118