# A149068 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 11 4 42 5 169 6 721 7 3105 8 13838 9 62047 10 283633 11 1303734 12 6061730 13 28318686 14 133282890 15 629750099 16 2990908792 17 14249878475 18 68148765938 19 326757727504 20 1571225170941 21 7571392176951 22 36566846891408 23 176917128336520 24 857500703098429 25 4162433708763959 26 20234912112599861 27 98493026288524495