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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -1 |
| 3 | 3 |
| 4 | 9 |
| 5 | -15 |
| 6 | 135 |
| 7 | -2205 |
| 8 | 21105 |
| 9 | 76545 |
| 10 | 694575 |
| 11 | -6392925 |
| 12 | -56600775 |
| 13 | 66891825 |
| 14 | -19964169225 |
| 15 | 741313447875 |
| 16 | 5375639894625 |
| 17 | 44667168170625 |
| 18 | -2328500019470625 |
| 19 | 5663134786183875 |
| 20 | -466442955127524375 |
| 21 | 11513119609487120625 |
[1,1,-1,3,9,-15,135,-2205,21105,76545,694575, -6392925,-56600775,66891825,-19964169225, 741313447875,5375639894625,44667168170625, -2328500019470625,5663134786183875, -466442955127524375,11513119609487120625] |