# A172405 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 15 5 47 6 153 7 515 8 1782 9 6293 10 22576 11 82043 12 301417 13 1117693 14 4177687 15 15723545 16 59538258 17 226656336 18 866983080 19 3330496250 20 12843380569 21 49700905874 22 192942347560 23 751191150163 24 2932439491143 25 11475503589091