# A133953 (b-file synthesized from sequence entry) 1 2 2 6 3 12 4 24 5 50 6 110 7 252 8 592 9 1410 10 3382 11 8140 12 19624 13 47346 14 114270 15 275836 16 665888 17 1607554 18 3880934 19 9369356 20 22619576 21 54608434 22 131836366 23 318281084 24 768398448 25 1855077890 26 4478554134 27 10812186060 28 26102926152 29 63018038258