n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 76 |
5 | 312 |
6 | 1384 |
7 | 6512 |
8 | 32400 |
9 | 168992 |
10 | 921184 |
11 | 5222208 |
12 | 30710464 |
13 | 186753920 |
14 | 1171979904 |
15 | 7573069568 |
16 | 50305536256 |
17 | 342949298688 |
18 | 2396286830080 |
19 | 17138748412928 |
20 | 125336396368896 |
21 | 936222729254912 |
22 | 7136574106003456 |
23 | 55466948299223040 |
24 | 439216305474605056 |
25 | 3540846129311916032 |
[1,2,6,20,76,312,1384,6512,32400,168992,921184, 5222208,30710464,186753920,1171979904,7573069568, 50305536256,342949298688,2396286830080, 17138748412928,125336396368896,936222729254912, 7136574106003456,55466948299223040, 439216305474605056,3540846129311916032] |