# A150076 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 18 4 66 5 237 6 910 7 3544 8 14316 9 57988 10 240037 11 1004974 12 4250588 13 18089218 14 77781528 15 336565989 16 1463454865 17 6397975200 18 28130673287 19 124136439392 20 549725055665 21 2444267057222 22 10904730274771 23 48773233678574 24 218764249195940 25 984016347295730 26 4435970838967158 27 20038228680358068