# A289927 (b-file synthesized from sequence entry) 0 1 1 4 2 15 3 53 4 187 5 656 6 2301 7 8071 8 28308 9 99293 10 348275 11 1221603 12 4284864 13 15029495 14 52717114 15 184909361 16 648583888 17 2274958177 18 7979591823 19 27989035739 20 98173708464 21 344351878525 22 1207840857737 23 4236595263812 24 14860185689435 25 52123251095327