# A293346 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 14 5 40 6 116 7 341 8 1010 9 3009 10 9012 11 27087 12 81658 13 246841 14 747728 15 2269137 16 6897656 17 20996048 18 63988866 19 195237052 20 596265104 21 1822623729 22 5575826696 23 17069972962 24 52292860854 25 160295112707 26 491629937802 27 1508617457047 28 4631590611528 29 14225646628664