# A006403 (b-file synthesized from sequence entry)
1 0
2 1
3 2
4 3
5 6
6 15
7 36
8 114
9 396
10 1565
11 6756
12 31563
13 154370
14 785113
15 4099948
16 21870704
17 118624544
18 652485364
19 3631820462
20 20426666644
21 115949791342
22 663640383400