# A109319 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 15
4 55
5 235
6 1119
7 5775
8 31663
9 182087
10 1087927
11 6706823
12 42433735
13 274403575
14 1807700679
15 12099813111
16 82113733447
17 563992581079
18 3914861387495
19 27429176467703
20 193781828188615
21 1379223584026967