# A262977 (b-file synthesized from sequence entry)
0 1
1 3
2 21
3 165
4 1365
5 11628
6 100947
7 888030
8 7888725
9 70607460
10 635745396
11 5752004349
12 52251400851
13 476260169700
14 4353548972850
15 39895566894540
16 366395202809685
17 3371363686069236
18 31074067324187580
19 286845713747883300
20 2651487106659130740
21 24539426037817994160