# A119915 (b-file synthesized from sequence entry) 0 0 1 1 2 4 3 13 4 40 5 117 6 332 7 921 8 2512 9 6761 10 18004 11 47525 12 124536 13 324317 14 840092 15 2166065 16 5562272 17 14232273 18 36300196 19 92321085 20 234192584 21 592695109 22 1496810732 23 3772761289 24 9492450672 25 23844342073 26 59804611060 27 149787196117