# A020100 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 6
5 25
6 137
7 880
8 6555
9 55413
10 523898
11 5477111
12 62737807
13 781370864
14 10512989798
15 151960488891
16 2348480282847
17 38643175563196
18 674499064375772
19 12447573642571061
20 242161887228200640
21 4953311329667740359