# A047770 (b-file synthesized from sequence entry)
1 0
2 1
3 5
4 26
5 133
6 708
7 3860
8 21604
9 123266
10 715216
11 4206956
12 25032840
13 150413322
14 911379384
15 5562367173
16 34164355715
17 211015212580
18 1309815397995
19 8166460799097
20 51120054233490
21 321156223592865
22 2024257417808379
23 12797201858645100
24 81125118975874896
25 515573991508620164
26 3284258706735132028