n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 3 |
4 | 4 |
5 | 25 |
6 | 68 |
7 | 275 |
8 | 904 |
9 | 3297 |
10 | 11400 |
11 | 40499 |
12 | 141900 |
13 | 500697 |
14 | 1760396 |
15 | 6200675 |
16 | 21820432 |
17 | 76823425 |
18 | 270407696 |
19 | 951914403 |
20 | 3350807700 |
21 | 11795463001 |
22 | 41521535700 |
23 | 146162319603 |
24 | 514512119704 |
25 | 1811159622625 |
26 | 6375545788568 |
27 | 22442862753875 |
[1,0,3,4,25,68,275,904,3297,11400,40499,141900, 500697,1760396,6200675,21820432,76823425, 270407696,951914403,3350807700,11795463001, 41521535700,146162319603,514512119704, 1811159622625,6375545788568,22442862753875] |