# A149887 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 14 4 45 5 152 6 535 7 1943 8 7289 9 27876 10 108448 11 428477 12 1716434 13 6947541 14 28393225 15 117079643 16 486515806 17 2034989189 18 8565051207 19 36256323523 20 154246683731 21 659219337990 22 2829613175204 23 12193980235432 24 52737388566862 25 228850945637483 26 996246088634899 27 4349589171641900