# A020118 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 1
5 4
6 20
7 121
8 862
9 7001
10 63876
11 646743
12 7195013
13 87239531
14 1145018832
15 16173391002
16 244622538903
17 3944538439806
18 67550220781672
19 1224347751667802
20 23415650750646696
21 471239971356764754