n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 48 |
5 | 240 |
6 | 1440 |
7 | 15120 |
8 | 120960 |
9 | 1088640 |
10 | 14515200 |
11 | 159667200 |
12 | 1916006400 |
13 | 31135104000 |
14 | 435891456000 |
15 | 6538371840000 |
16 | 125536739328000 |
17 | 2134124568576000 |
18 | 38414242234368000 |
19 | 851515702861824000 |
[0,1,2,6,48,240,1440,15120,120960,1088640, 14515200,159667200,1916006400,31135104000, 435891456000,6538371840000,125536739328000, 2134124568576000,38414242234368000, 851515702861824000] |