# A137747 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 0
4 0
5 0
6 0
7 1
8 7
9 34
10 143
11 555
12 2050
13 7343
14 25809
15 89642
16 308986
17 1059786
18 3623524
19 12365973
20 42160774
21 143701920