n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | -2 |
4 | 8 |
5 | -24 |
6 | -16 |
7 | -720 |
8 | 12032 |
9 | 0 |
10 | -7936 |
11 | -3628800 |
12 | -58190848 |
13 | -479001600 |
14 | -22368256 |
15 | 87178291200 |
16 | 6174957043712 |
17 | -20922789888000 |
18 | 47215125069824 |
19 | -6402373705728000 |
20 | -164824694455533568 |
21 | 2432902008176640000 |
22 | -4951498053124096 |
23 | -1124000727777607680000 |
[1,0,-2,8,-24,-16,-720,12032,0,-7936,-3628800, -58190848,-479001600,-22368256,87178291200, 6174957043712,-20922789888000,47215125069824, -6402373705728000,-164824694455533568, 2432902008176640000,-4951498053124096, -1124000727777607680000] |