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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | 6 |
| 4 | -24 |
| 5 | 122 |
| 6 | -726 |
| 7 | 5060 |
| 8 | -40400 |
| 9 | 363240 |
| 10 | -3630593 |
| 11 | 39926622 |
| 12 | -479060379 |
| 13 | 6227402193 |
| 14 | -87180957830 |
| 15 | 1307694352218 |
| 16 | -20922949679481 |
| 17 | 355688785859223 |
| 18 | -6402385922818921 |
| 19 | 121645216453639396 |
| 20 | -2432903168507861321 |
[1,-2,6,-24,122,-726,5060,-40400,363240,-3630593, 39926622,-479060379,6227402193,-87180957830, 1307694352218,-20922949679481,355688785859223, -6402385922818921,121645216453639396, -2432903168507861321] |