# A149303 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 11 4 46 5 174 6 740 7 3109 8 13614 9 59878 10 268728 11 1214032 12 5546558 13 25498422 14 118054700 15 549367029 16 2569472992 17 12066493332 18 56883907318 19 269035738044 20 1276275732442 21 6070582701920 22 28945492531456 23 138319277521604 24 662316708110916 25 3177211680848070 26 15267484859916084 27 73479492803233664