n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 10 |
4 | 44 |
5 | 288 |
6 | 1896 |
7 | 15888 |
8 | 137952 |
9 | 1419840 |
10 | 15255360 |
11 | 186693120 |
12 | 2387093760 |
13 | 33898314240 |
14 | 502247692800 |
15 | 8123141376000 |
16 | 136785729024000 |
17 | 2483065912320000 |
18 | 46822564905984000 |
19 | 942853671825408000 |
20 | 19678282007924736000 |
21 | 435355106182520832000 |
[1,2,10,44,288,1896,15888,137952,1419840,15255360, 186693120,2387093760,33898314240,502247692800, 8123141376000,136785729024000,2483065912320000, 46822564905984000,942853671825408000, 19678282007924736000,435355106182520832000] |