# A129421 (b-file synthesized from sequence entry)
1 0
2 1
3 1
4 6
5 15
6 120
7 933
8 13303
9 252207
10 6450828
11 205475039
12 7936493756
13 363639228194
14 19476976825809
15 1205115679461426
16 85288127619421544
17 6845235025444882069
18 618411485467843477405
19 62471139399366989007575
20 7014991719815977343879171