# A197463 (b-file synthesized from sequence entry) 1 2 2 3 3 6 4 13 5 28 6 66 7 148 8 349 9 828 10 2005 11 4880 12 12043 13 29852 14 74645 15 187498 16 473448 17 1199630 18 3050554 19 7778234 20 19885465 21 50950796 22 130824763 23 336555890 24 867389312 25 2239220294 26 5789804688