# A147010 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 1
5 3
6 5
7 9
8 19
9 56
10 167
11 758
12 2457
13 14728
14 66625
15 526225
16 3298653
17 34425031
18 276512141
19 3848586911
20 41626261490