# A001884 (b-file synthesized from sequence entry)
1 1
2 0
3 1
4 2
5 20
6 104
7 775
8 6140
9 55427
10 553802
11 6087992
12 72994152
13 948103477
14 13262133736
15 198769630061
16 3177862894922
17 53984653965996
18 971068821144112
19 18438722595913195
20 368558842844143268
21 7735520783692157215
22 170095060428041137778
23 3910332719957508452016
24 93806427360751009531632