# A048119 (b-file synthesized from sequence entry)
2 1
3 3
4 9
5 30
6 102
7 360
8 1290
9 4704
10 17334
11 64512
12 241836
13 912384
14 3459876
15 13178988
16 50389236
17 193295652
18 743610528
19 2867892588
20 11085281328
21 42933166380
22 166575534264
23 647329281456
24 2519234973996
25 9817121868084