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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 | 0 |
| 4 | 2 |
| 5 | -4 |
| 6 | 8 |
| 7 | -24 |
| 8 | 16 |
| 9 | 272 |
| 10 | -2304 |
| 11 | 14528 |
| 12 | -68352 |
| 13 | 181312 |
| 14 | 843776 |
| 15 | -20265088 |
| 16 | 221382656 |
| 17 | -1771263744 |
| 18 | 9865887744 |
| 19 | -4388386816 |
| 20 | -888186732544 |
| 21 | 16325400792064 |
| 22 | -200433787207680 |
| 23 | 1796402984175616 |
| 24 | -8060855544971264 |
[0,1,-1,0,2,-4,8,-24,16,272,-2304,14528,-68352, 181312,843776,-20265088,221382656,-1771263744, 9865887744,-4388386816,-888186732544, 16325400792064,-200433787207680,1796402984175616, -8060855544971264] |