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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 | 0 |
| 4 | 12 |
| 5 | -60 |
| 6 | 90 |
| 7 | -420 |
| 8 | 12320 |
| 9 | -124992 |
| 10 | 753480 |
| 11 | -6481200 |
| 12 | 110644776 |
| 13 | -1613081184 |
| 14 | 18917874976 |
| 15 | -250425171360 |
| 16 | 4359533351680 |
| 17 | -78311204695424 |
| 18 | 1329852024578496 |
| 19 | -23869209971687040 |
| 20 | 483284209880289152 |
[1,0,0,0,12,-60,90,-420,12320,-124992,753480, -6481200,110644776,-1613081184,18917874976, -250425171360,4359533351680,-78311204695424, 1329852024578496,-23869209971687040, 483284209880289152] |