n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 24 |
4 | 120 |
5 | 840 |
6 | 7560 |
7 | 83160 |
8 | 1081080 |
9 | 17297280 |
10 | 294053760 |
11 | 5587021440 |
12 | 128501493120 |
13 | 3212537328000 |
14 | 93163582512000 |
15 | 2888071057872000 |
16 | 106858629141264000 |
17 | 4381203794791824000 |
18 | 188391763176048432000 |
19 | 8854412869274276304000 |
20 | 433866230594439538896000 |
[1,2,6,24,120,840,7560,83160,1081080,17297280, 294053760,5587021440,128501493120,3212537328000, 93163582512000,2888071057872000, 106858629141264000,4381203794791824000, 188391763176048432000,8854412869274276304000, 433866230594439538896000] |