# A099487 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 14
4 53
5 195
6 727
7 2716
8 10137
9 37829
10 141179
11 526890
12 1966381
13 7338631
14 27388143
15 102213944
16 381467633
17 1423656585
18 5313158707
19 19828978246
20 74002754277
21 276182038859
22 1030725401159
23 3846719565780
24 14356152861961