# A026861 (b-file synthesized from sequence entry)
1 1
2 5
3 22
4 95
5 411
6 1790
7 7855
8 34725
9 154573
10 692450
11 3120206
12 14135555
13 64356345
14 294341325
15 1351889910
16 6233399525
17 28845511125
18 133933280000
19 623811120960
20 2913924782375
21 13648296620445
22 64087737455725
23 301644762913977