n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 36 |
3 | 1 |
4 | 3600 |
5 | 1 |
6 | 211680 |
7 | 1 |
8 | 10886400 |
9 | 1 |
10 | 526901760 |
11 | 1 |
12 | 16999766784000 |
13 | 1 |
14 | 1120863744000 |
15 | 1 |
16 | 181400588328960000 |
17 | 1 |
18 | 97072790126247936000 |
19 | 1 |
20 | 16860010916664115200000 |
21 | 1 |
22 | 324325300906011525120000 |
23 | 1 |
[1,4,36,1,3600,1,211680,1,10886400,1,526901760,1, 16999766784000,1,1120863744000,1, 181400588328960000,1,97072790126247936000,1, 16860010916664115200000,1, 324325300906011525120000,1] |