n | a(n) |
---|---|
3 | 1 |
4 | 4 |
5 | 20 |
6 | 60 |
7 | 420 |
8 | 3360 |
9 | 10080 |
10 | 100800 |
11 | 1108800 |
12 | 3326400 |
13 | 43243200 |
14 | 605404800 |
15 | 1816214400 |
16 | 29059430400 |
17 | 494010316800 |
18 | 1482030950400 |
19 | 28158588057600 |
20 | 563171761152000 |
21 | 1689515283456000 |
22 | 37169336236032000 |
23 | 854894733428736000 |
24 | 2564684200286208000 |
[1,4,20,60,420,3360,10080,100800,1108800,3326400, 43243200,605404800,1816214400,29059430400, 494010316800,1482030950400,28158588057600, 563171761152000,1689515283456000, 37169336236032000,854894733428736000, 2564684200286208000] |