n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | -2 |
4 | 9 |
5 | -24 |
6 | 130 |
7 | -720 |
8 | 8505 |
9 | -35840 |
10 | 412776 |
11 | -3628800 |
12 | 42030450 |
13 | -479001600 |
14 | 7019298000 |
15 | -82614884352 |
16 | 1886805545625 |
17 | -20922789888000 |
18 | 374426276224000 |
19 | -6402373705728000 |
20 | 134987215801622184 |
21 | -2379913632645120000 |
22 | 55685679780013920000 |
[1,1,-2,9,-24,130,-720,8505,-35840,412776, -3628800,42030450,-479001600,7019298000, -82614884352,1886805545625,-20922789888000, 374426276224000,-6402373705728000, 134987215801622184,-2379913632645120000, 55685679780013920000] |