# A221989 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 12
5 34
6 104
7 406
8 1112
9 3980
10 15216
11 68034
12 312048
13 1625968
14 8771376
15 53270068
16 319218912
17 2135312542
18 14420106264
19 109051882344
20 815868128288
21 6772099860398
22 56501841264216
23 519359404861294