# A048781 (b-file synthesized from sequence entry)
3 1
4 2
5 5
6 13
7 35
8 86
9 250
10 687
11 2001
12 5897
13 17847
14 54683
15 170578
16 537468
17 1714312
18 5516392
19 17910741
20 58588966
21 193035920
22 640132185
23 2135841554
24 7167550473
25 24186506740