# A175005 (b-file synthesized from sequence entry) 0 0 1 1 2 4 3 13 4 42 5 137 6 448 7 1465 8 4790 9 15661 10 51204 11 167413 12 547362 13 1789617 14 5851208 15 19130705 16 62548430 17 204504021 18 668632204 19 2186113613 20 7147565882 21 23369187097 22 76406277968 23 249812682345 24 816770269670 25 2670455587581