# A148758 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 7 4 28 5 81 6 352 7 1154 8 5208 9 18450 10 85202 11 317719 12 1489930 13 5762701 14 27316040 15 108584686 16 518762827 17 2106471761 18 10123531026 19 41810856886 20 201869469476 21 845355773410 22 4096563483555 23 17353296616714 24 84345572763846 25 360774559654579 26 1757889969930777 27 7581645820626841 28 37018777212600691