n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 8 |
4 | 90 |
5 | 288 |
6 | 840 |
7 | 17280 |
8 | 28350 |
9 | 89600 |
10 | 598752 |
11 | 17418240 |
12 | 63063000 |
13 | 402361344000 |
14 | 5003856000 |
15 | 295206912 |
16 | 976924698750 |
17 | 342372925440000 |
18 | 15209113920000 |
19 | 5377993912811520000 |
20 | 96852084769440 |
21 | 89903156428800000 |
22 | 37556196837868800000 |
23 | 73570956727261593600000 |
[1,2,6,8,90,288,840,17280,28350,89600,598752, 17418240,63063000,402361344000,5003856000, 295206912,976924698750,342372925440000, 15209113920000,5377993912811520000,96852084769440, 89903156428800000,37556196837868800000, 73570956727261593600000] |