# A132846 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 13
4 73
5 466
6 3309
7 25425
8 209717
9 1837168
10 16995545
11 164906160
12 1671977735
13 17635855420
14 193014602116
15 2185071349740
16 25536219128057
17 307379906553394
18 3804874686396912
19 48350298542927709
20 629940434070025851