# A027090 (b-file synthesized from sequence entry) 2 1 3 3 4 9 5 28 6 84 7 246 8 714 9 2059 10 5917 11 16971 12 48633 13 139333 14 399267 15 1144669 16 3283839 17 9427981 18 27090715 19 77911897 20 224272499 21 646157234 22 1863317958 23 5377939756 24 15535195892 25 44913790501 26 129955421387 27 376313609029