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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | -17863240 |
| 9 | 351004879413684 |
| 10 | -6834956902420811530200 |
| 11 | 133203071884610819994409432410 |
| 12 | -2595734922068255016665440444288632600 |
| 13 | 50583558850117484638411502782868591609069220 |
[1,-17863240,351004879413684, -6834956902420811530200, 133203071884610819994409432410, -2595734922068255016665440444288632600, 50583558850117484638411502782868591609069220] |