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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 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | -24 |
| 5 | 120 |
| 6 | -360 |
| 7 | 0 |
| 8 | 20160 |
| 9 | -302400 |
| 10 | 3628800 |
| 11 | -39916800 |
| 12 | 419126400 |
| 13 | -4151347200 |
| 14 | 36324288000 |
| 15 | -207048441600 |
| 16 | -1743565824000 |
| 17 | 103742166528000 |
| 18 | -2925529096089600 |
| 19 | 69945932735078400 |
| 20 | -1571249213614080000 |
| 21 | 34354603773794304000 |
| 22 | -741528257908838400000 |
[1,0,0,6,-24,120,-360,0,20160,-302400,3628800, -39916800,419126400,-4151347200,36324288000, -207048441600,-1743565824000,103742166528000, -2925529096089600,69945932735078400, -1571249213614080000,34354603773794304000, -741528257908838400000] |