# A091031 (b-file synthesized from sequence entry)
2 1
3 16
4 114
5 644
6 3270
7 15642
8 72072
9 323752
10 1428102
11 6214520
12 26761196
13 114287736
14 484816540
15 2045277990
16 8588492100
17 35923392720
18 149753379270
19 622458753840
20 2580709189740
21 10675646755800
22 44074384410420