# A046635 (b-file synthesized from sequence entry)
0 1
1 3
2 15
3 99
4 689
5 4817
6 33713
7 235987
8 1651903
9 11563315
10 80943201
11 566602401
12 3966216801
13 27763517603
14 194344623215
15 1360412362499
16 9522886537489
17 66660205762417
18 466621440336913
19 3266350082358387
20 22864450576508703