# A148806 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 8 4 26 5 84 6 305 7 1086 8 4078 9 15461 10 60478 11 236475 12 944909 13 3810840 14 15527946 15 63575099 16 263179621 17 1096167860 18 4587850961 19 19302087093 20 81731578479 21 347390982785 22 1481651268480 23 6347010201749 24 27296848791921 25 117702207650679 26 509009215641176 27 2208567192496882 28 9607641406127315