# A120921 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 12
4 56
5 283
6 1503
7 8262
8 46591
9 267984
10 1565949
11 9269559
12 55465035
13 334919996
14 2038268620
15 12489068727
16 76980573203
17 476994419698
18 2969444848029
19 18563305700106
20 116485903375761
21 733457500802353