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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 12 |
| 3 | -1472 |
| 4 | -159792 |
| 5 | -16362304 |
| 6 | -1834702400 |
| 7 | -218477736448 |
| 8 | -23399883425536 |
| 9 | -225490426670080 |
| 10 | 1498513205985651712 |
| 11 | 985137918553296764928 |
| 12 | 536781621147089121005568 |
| 13 | 285950922368074600238661632 |
[1,4,12,-1472,-159792,-16362304,-1834702400, -218477736448,-23399883425536,-225490426670080, 1498513205985651712,985137918553296764928, 536781621147089121005568, 285950922368074600238661632] |