The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | -4 |
| 5 | 20 |
| 6 | -120 |
| 7 | 632 |
| 8 | -6704 |
| 9 | 44480 |
| 10 | -630240 |
| 11 | 5566112 |
| 12 | -91544704 |
| 13 | 1063375040 |
| 14 | -19258162560 |
| 15 | 283305867392 |
| 16 | -5578129589504 |
| 17 | 99671066259200 |
| 18 | -2135174387566080 |
| 19 | 44678363702761472 |
| 20 | -1044242762736047104 |
[0,1,0,2,-4,20,-120,632,-6704,44480,-630240, 5566112,-91544704,1063375040,-19258162560, 283305867392,-5578129589504,99671066259200, -2135174387566080,44678363702761472, -1044242762736047104] |