n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | -2 |
3 | -12 |
4 | 24 |
5 | 420 |
6 | -720 |
7 | -30240 |
8 | 40320 |
9 | 3764880 |
10 | -3628800 |
11 | -728481600 |
12 | 479001600 |
13 | 203545742400 |
14 | -87178291200 |
15 | -77806624896000 |
16 | 20922789888000 |
17 | 39045031657632000 |
18 | -6402373705728000 |
19 | -24904933604014464000 |
20 | 2432902008176640000 |
21 | 19678195269815322240000 |
22 | -1124000727777607680000 |
[1,1,-2,-12,24,420,-720,-30240,40320,3764880, -3628800,-728481600,479001600,203545742400, -87178291200,-77806624896000,20922789888000, 39045031657632000,-6402373705728000, -24904933604014464000,2432902008176640000, 19678195269815322240000,-1124000727777607680000] |