# A189837 (b-file synthesized from sequence entry)
1 1
2 2
3 2
4 8
5 12
6 22
7 58
8 276
9 648
10 2304
11 6508
12 24528
13 96402
14 466922
15 2271738
16 13723826
17 76579326
18 512425626
19 3281233020
20 24654941268
21 175398054696