# A026872 (b-file synthesized from sequence entry)
1 1
2 4
3 16
4 65
5 268
6 1120
7 4738
8 20265
9 87542
10 381600
11 1677170
12 7427098
13 33118073
14 148618605
15 670849720
16 3044548675
17 13886260129
18 63627798355
19 292789942333
20 1352614829275
21 6271530026012
22 29176789293146
23 136163014291526
24 637294991967740