# A217664 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 7
4 23
5 72
6 227
7 725
8 2332
9 7537
10 24465
11 79720
12 260633
13 854539
14 2808768
15 9252315
16 30536925
17 100959558
18 334301159
19 1108483583
20 3680134756
21 12231824111
22 40697552035
23 135536687436
24 451776392011
25 1507088458381
26 5031254413136
27 16807872970501
28 56185887793379