# A020126 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 2
5 6
6 29
7 178
8 1270
9 10366
10 95020
11 966033
12 10787363
13 131246246
14 1728075563
15 24481070470
16 371296235456
17 6002622473193
18 103045019123133
19 1871984514070245
20 35879703186346360
21 723574014257984911