n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 24 |
5 | 17280 |
6 | 207360 |
7 | 696729600 |
8 | 12541132800 |
9 | 115880067072000 |
10 | 1366643159020339200000 |
11 | 40999294770610176000000 |
12 | 1854768736099424576471040000000 |
13 | 109950690675973888893203251200000000 |
[1,1,4,24,17280,207360,696729600,12541132800, 115880067072000,1366643159020339200000, 40999294770610176000000, 1854768736099424576471040000000, 109950690675973888893203251200000000] |