# A148687 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 7 4 22 5 67 6 228 7 775 8 2787 9 10126 10 37764 11 143329 12 550368 13 2149095 14 8453575 15 33691399 16 135090849 17 547090691 18 2227753448 19 9139576254 20 37693231937 21 156318494839 22 651542940226 23 2727163759562 24 11468106477863 25 48390347257167 26 205025987747295 27 871248671621395 28 3715469560288270