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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -1 |
| 3 | 2 |
| 4 | -6 |
| 5 | 16 |
| 6 | -72 |
| 7 | 440 |
| 8 | -2800 |
| 9 | 20224 |
| 10 | -169984 |
| 11 | 1582976 |
| 12 | -16076544 |
| 13 | 178612864 |
| 14 | -2155087872 |
| 15 | 27969867008 |
| 16 | -388732745728 |
| 17 | 5765737517056 |
| 18 | -90872771018752 |
| 19 | 1516228355846144 |
| 20 | -26703924688453632 |
| 21 | 495092243779256320 |
[0,1,-1,2,-6,16,-72,440,-2800,20224,-169984, 1582976,-16076544,178612864,-2155087872, 27969867008,-388732745728,5765737517056, -90872771018752,1516228355846144, -26703924688453632,495092243779256320] |