# A209357 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 6 4 14 5 31 6 72 7 166 8 390 9 922 10 2197 11 5273 12 12728 13 30892 14 75327 15 184476 16 453505 17 1118798 18 2768843 19 6872437 20 17103411 21 42670102 22 106697009 23 267359854 24 671260241 25 1688411587 26 4254084396 27 10735614274 28 27132998096 29 68671994940 30 174035109012 31 441607820562