n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 4 |
5 | 18 |
6 | 33 |
7 | 161 |
8 | 433 |
9 | 1705 |
10 | 10789 |
11 | 29157 |
12 | 88720 |
13 | 490289 |
14 | 1881309 |
15 | 4731356 |
16 | 17455195 |
17 | 36595263 |
18 | 178053588 |
19 | 405917904 |
20 | 3256229459 |
[1,1,1,3,4,18,33,161,433,1705,10789,29157,88720, 490289,1881309,4731356,17455195,36595263, 178053588,405917904,3256229459] |