# A357661 (b-file synthesized from sequence entry)
0 1
1 0
2 2
3 12
4 60
5 320
6 2040
7 15568
8 133648
9 1230336
10 11962400
11 123144384
12 1349008320
13 15731096576
14 194349866880
15 2527082917120
16 34392647418112
17 488243791183872
18 7216792525799936
19 110936087161801728
20 1771199461131500544
21 29324602146652307456