# A020093 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 5
5 22
6 117
7 749
8 5550
9 46705
10 439803
11 4581281
12 52302950
13 649428294
14 8713162940
15 125614765717
16 1936560971460
17 31791875948135
18 553708506096682
19 10197464987280555
20 198000778503030765
21 4042515894436878102