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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | -146 |
| 3 | -1880 |
| 4 | 63436 |
| 5 | 1471984 |
| 6 | -45495224 |
| 7 | -1612749344 |
| 8 | 45140586640 |
| 9 | 2270685496384 |
| 10 | -56732233335584 |
| 11 | -3905439437484416 |
| 12 | 85475082054073024 |
| 13 | 7934074594685996800 |
| 14 | -148274224427133801344 |
| 15 | -18587578078456375947776 |
| 16 | 285956053044109633474816 |
[1,4,-146,-1880,63436,1471984,-45495224, -1612749344,45140586640,2270685496384, -56732233335584,-3905439437484416, 85475082054073024,7934074594685996800, -148274224427133801344,-18587578078456375947776, 285956053044109633474816] |