# A147435 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 1
5 1
6 13
7 21
8 57
9 259
10 1017
11 4255
12 25913
13 160493
14 1488777
15 11698881
16 154711435
17 1737788683
18 30091739925