# A147168 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 1
5 1
6 1
7 3
8 13
9 37
10 67
11 147
12 499
13 1519
14 5231
15 22885
16 101333
17 548323
18 3012179
19 18194005
20 121163279
21 875290875