# A171991 (b-file synthesized from sequence entry)
1 1
2 1
3 4
4 25
5 190
6 1644
7 15636
8 159977
9 1736392
10 19804646
11 235758596
12 2914539808
13 37275052828
14 491727695628
15 6675266957376
16 93073877729749
17 1330851640325930
18 19490214361291636
19 292025342161401292
20 4472427699080578554
21 69958787931298226280
22 1116911386287712897260