# A149205 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 10 4 40 5 129 6 537 7 1933 8 8328 9 31833 10 140729 11 559013 12 2518826 13 10280324 14 46991877 15 195714236 16 904660544 17 3827438751 18 17850086730 19 76473277330 20 359252690128 21 1554944844436 22 7349047127951 23 32080478571693 24 152395736480523 25 670039535488503 26 3196878057937120 27 14142253394919290