# A294818 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 21 5 76 6 271 7 938 8 3146 9 10252 10 32583 11 101368 12 309697 13 931708 14 2766374 15 8121630 16 23612985 17 68076148 18 194824915 19 553979438 20 1566301826 21 4406286736 22 12340335627 23 34422720496 24 95676632581 25 265071811456 26 732238423646 27 2017390937058 28 5544712079421 29 15205817438572