# A026873 (b-file synthesized from sequence entry)
2 1
3 6
4 29
5 131
6 576
7 2505
8 10857
9 47081
10 204724
11 893766
12 3920310
13 17283214
14 76596745
15 341264480
16 1528405584
17 6880122182
18 31123426923
19 141456560459
20 645811464667
21 2960966353657
22 13630215685869
23 62981140857061
24 292049203818249