n | a(n) |
---|---|
2 | 0 |
3 | 0 |
4 | 1 |
5 | 4 |
6 | 28 |
7 | 85 |
8 | 630 |
9 | 3096 |
10 | 23220 |
11 | 123952 |
12 | 1036080 |
13 | 7230828 |
14 | 66349440 |
15 | 500721252 |
16 | 5080269600 |
17 | 45925520096 |
18 | 508031496000 |
19 | 4919774752448 |
20 | 59256847036800 |
21 | 656763354386032 |
22 | 8532986691801600 |
23 | 100525956801641104 |
24 | 1405335512577427200 |
25 | 18431883446961030912 |
[0,0,1,4,28,85,630,3096,23220,123952,1036080, 7230828,66349440,500721252,5080269600,45925520096, 508031496000,4919774752448,59256847036800, 656763354386032,8532986691801600, 100525956801641104,1405335512577427200, 18431883446961030912] |