# A147375 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 1
5 1
6 5
7 21
8 61
9 266
10 891
11 3074
12 18035
13 122510
14 915879
15 8736750
16 97430523
17 1219777035
18 17287269221