# A026306 (b-file synthesized from sequence entry)
0 0
1 2
2 12
3 69
4 392
5 2235
6 12804
7 73710
8 426192
9 2473704
10 14405800
11 84137130
12 492652824
13 2891110235
14 16999928820
15 100136858625
16 590778928800
17 3490370847876
18 20647839813048
19 122287764072938
20 725023671281520
21 4302720916638417