# A149434 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 13 4 46 5 164 6 606 7 2239 8 8472 9 31920 10 122158 11 466494 12 1797288 13 6923488 14 26811944 15 103876331 16 403901878 17 1571264580 18 6128614886 19 23917209854 20 93517065586 21 365867191042 22 1433433089074 23 5619276707450 24 22052884573432 25 86593169212632 26 340319969605758 27 1338154414920772 28 5265502775297050