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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -240 |
| 3 | 1441 |
| 4 | 288240 |
| 5 | -1442401 |
| 6 | -844819920 |
| 7 | 23675154737 |
| 8 | 4608353725680 |
| 9 | -41510702322751 |
| 10 | -40386030879493200 |
| 11 | 889253839136525971 |
| 12 | 519075935403246814320 |
| 13 | -6753768299776888053301 |
| 14 | -9198693847666760264886480 |
| 15 | 1104788951165762414443138369 |
[1,-1,-240,1441,288240,-1442401,-844819920, 23675154737,4608353725680,-41510702322751, -40386030879493200,889253839136525971, 519075935403246814320,-6753768299776888053301, -9198693847666760264886480, 1104788951165762414443138369] |