n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 22 |
4 | 126 |
5 | 751 |
6 | 4595 |
7 | 28514 |
8 | 179277 |
9 | 1136405 |
10 | 7256229 |
11 | 46583010 |
12 | 300438175 |
13 | 1944986187 |
14 | 12632217312 |
15 | 82269089182 |
16 | 537071072123 |
17 | 3513452296105 |
18 | 23026993173298 |
19 | 151165338147804 |
20 | 993811676366531 |
21 | 6542280703133297 |
[1,1,4,22,126,751,4595,28514,179277,1136405, 7256229,46583010,300438175,1944986187,12632217312, 82269089182,537071072123,3513452296105, 23026993173298,151165338147804,993811676366531, 6542280703133297] |