n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 4 |
3 | 6 |
4 | 120 |
5 | 600 |
6 | 10080 |
7 | 95760 |
8 | 1693440 |
9 | 23950080 |
10 | 475372800 |
11 | 8821612800 |
12 | 199743667200 |
13 | 4533271142400 |
14 | 116906088499200 |
15 | 3112264995840000 |
16 | 90679371374592000 |
17 | 2757644630028288000 |
18 | 89895729202126848000 |
[1,0,4,6,120,600,10080,95760,1693440,23950080, 475372800,8821612800,199743667200,4533271142400, 116906088499200,3112264995840000, 90679371374592000,2757644630028288000, 89895729202126848000] |