# A145550 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 4 5 9 6 20 7 48 8 115 9 286 10 719 11 1842 12 4766 13 12486 14 32972 15 87807 16 235365 17 634792 18 1720976 19 4688090 20 12824381 21 35216108 22 97037603 23 268229329 24 743562936 25 2066686470 26 5758171390 27 16079351152