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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 | -2 |
| 3 | 9 |
| 4 | -64 |
| 5 | 620 |
| 6 | -7536 |
| 7 | 109032 |
| 8 | -1809984 |
| 9 | 33562944 |
| 10 | -681799680 |
| 11 | 14980204800 |
| 12 | -354016189440 |
| 13 | 9017296704000 |
| 14 | -249422713344000 |
| 15 | 7530733353024000 |
| 16 | -246212297533440000 |
| 17 | 8509848430274150400 |
| 18 | -302719894872204902400 |
[0,1,-2,9,-64,620,-7536,109032,-1809984,33562944, -681799680,14980204800,-354016189440, 9017296704000,-249422713344000,7530733353024000, -246212297533440000,8509848430274150400, -302719894872204902400] |