n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 12 |
6 | 60 |
7 | 180 |
8 | 630 |
9 | 10080 |
10 | 18144 |
11 | 453600 |
12 | 2494800 |
13 | 59875200 |
14 | 778377600 |
15 | 1089728640 |
16 | 40864824000 |
17 | 1307674368000 |
18 | 22230464256000 |
19 | 15390321408000 |
20 | 380140938777600 |
21 | 76028187755520000 |
22 | 1596591942865920000 |
[1,1,1,3,12,60,180,630,10080,18144,453600,2494800, 59875200,778377600,1089728640,40864824000, 1307674368000,22230464256000,15390321408000, 380140938777600,76028187755520000, 1596591942865920000] |