# A243806 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 24
4 123
5 786
6 6112
7 56504
8 607833
9 7467066
10 103120674
11 1580416008
12 26598861595
13 487397118314
14 9654657563748
15 205508121922824
16 4676833854264603
17 113293413849825702
18 2910255267932697130
19 79008535866112062440
20 2260164362082172615833
21 67947314033110789074486