# A149042 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 10 4 36 5 139 6 567 7 2354 8 10051 9 43745 10 192742 11 858883 12 3869637 13 17569721 14 80307106 15 369430312 16 1708635040 17 7938060632 18 37034246311 19 173437700581 20 814901766911 21 3840290612220 22 18148048110860 23 85975458675768 24 408225045863473 25 1942410972814486 26 9260276749410251 27 44226028788343006