# A069725 (b-file synthesized from sequence entry)
1 1
2 1
3 3
4 11
5 62
6 342
7 2152
8 13768
9 91800
10 622616
11 4301792
12 30100448
13 213019072
14 1521473984
15 10954616064
16 79420280064
17 579300888960
18 4248201302400
19 31302536066560
20 231638727063040