n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 0 |
3 | -24 |
4 | -60 |
5 | 720 |
6 | 5040 |
7 | -40320 |
8 | -589680 |
9 | 3628800 |
10 | 99792000 |
11 | -479001600 |
12 | -23740516800 |
13 | 87178291200 |
14 | 7682586912000 |
15 | -20922789888000 |
16 | -3281772285792000 |
17 | 6402373705728000 |
18 | 1801868049805824000 |
19 | -2432902008176640000 |
20 | -1241948957556827520000 |
21 | 1124000727777607680000 |
[1,2,0,-24,-60,720,5040,-40320,-589680,3628800, 99792000,-479001600,-23740516800,87178291200, 7682586912000,-20922789888000,-3281772285792000, 6402373705728000,1801868049805824000, -2432902008176640000,-1241948957556827520000, 1124000727777607680000] |