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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 8 |
| 3 | -16 |
| 4 | 96 |
| 5 | -320 |
| 6 | 1408 |
| 7 | -5376 |
| 8 | 22016 |
| 9 | -87040 |
| 10 | 350208 |
| 11 | -1396736 |
| 12 | 5595136 |
| 13 | -22364160 |
| 14 | 89489408 |
| 15 | -357892096 |
| 16 | 1431699456 |
| 17 | -5726535680 |
| 18 | 22906667008 |
| 19 | -91625619456 |
| 20 | 366504574976 |
| 21 | -1466014105600 |
| 22 | 5864064811008 |
| 23 | -23456242466816 |
| 24 | 93825003421696 |
| 25 | -375299946577920 |
[1,0,8,-16,96,-320,1408,-5376,22016,-87040,350208, -1396736,5595136,-22364160,89489408,-357892096, 1431699456,-5726535680,22906667008,-91625619456, 366504574976,-1466014105600,5864064811008, -23456242466816,93825003421696,-375299946577920] |