n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 12 |
6 | 34 |
7 | 125 |
8 | 450 |
9 | 1780 |
10 | 7021 |
11 | 28521 |
12 | 115553 |
13 | 472578 |
14 | 1927634 |
15 | 7890893 |
16 | 32221475 |
17 | 131812746 |
18 | 538059836 |
19 | 2198986587 |
20 | 8970624060 |
21 | 36628143111 |
22 | 149328243327 |
23 | 609238673619 |
[1,1,2,4,12,34,125,450,1780,7021,28521,115553, 472578,1927634,7890893,32221475,131812746, 538059836,2198986587,8970624060,36628143111, 149328243327,609238673619] |