# A054857 (b-file synthesized from sequence entry) 0 1 1 1 2 8 3 28 4 117 5 472 6 1916 7 7765 8 31497 9 127707 10 517881 11 2100025 12 8515772 13 34532063 14 140030059 15 567832091 16 2302600696 17 9337214060 18 37863085664 19 153537580071 20 622606110920 21 2524713292359 22 10237896957896 23 41515420557135