# A026158 (b-file synthesized from sequence entry)
0 1
1 2
2 16
3 120
4 946
5 7644
6 62831
7 522784
8 4389779
9 37123554
10 315735122
11 2697813440
12 23140821753
13 199142458570
14 1718554831623
15 14866697304316
16 128879838356309
17 1119350439620210
18 9737942597361615
19 84842252277338304
20 740178198190767003
21 6465231396756806046