n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 12 |
3 | 120 |
4 | 140 |
5 | 252 |
6 | 4752 |
7 | 68640 |
8 | 109200 |
9 | 257040 |
10 | 6139584 |
11 | 109549440 |
12 | 210974400 |
13 | 591192000 |
14 | 16576876800 |
15 | 343108846080 |
16 | 758663942400 |
17 | 2419157664000 |
18 | 76585170816000 |
19 | 1777303822694400 |
20 | 4379008275532800 |
21 | 15472932418944000 |
22 | 540078624594432000 |
23 | 13756331587654656000 |
[1,1,12,120,140,252,4752,68640,109200,257040, 6139584,109549440,210974400,591192000,16576876800, 343108846080,758663942400,2419157664000, 76585170816000,1777303822694400,4379008275532800, 15472932418944000,540078624594432000, 13756331587654656000] |