n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 6 |
4 | 36 |
5 | 252 |
6 | 1260 |
7 | 5040 |
8 | 60480 |
9 | 786240 |
10 | 11793600 |
11 | 165110400 |
12 | 1651104000 |
13 | 18162144000 |
14 | 163459296000 |
15 | 1307674368000 |
16 | 31384184832000 |
17 | 784604620800000 |
18 | 21184324761600000 |
19 | 550792443801600000 |
20 | 16523773314048000000 |
[1,1,3,6,36,252,1260,5040,60480,786240,11793600, 165110400,1651104000,18162144000,163459296000, 1307674368000,31384184832000,784604620800000, 21184324761600000,550792443801600000, 16523773314048000000] |