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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | -1 |
| 2 | -2 |
| 3 | -3 |
| 4 | 0 |
| 5 | 24 |
| 6 | 108 |
| 7 | 162 |
| 8 | -1440 |
| 9 | -14256 |
| 10 | -54432 |
| 11 | 177552 |
| 12 | 4432320 |
| 13 | 31796064 |
| 14 | 10520928 |
| 15 | -2531636208 |
| 16 | -31078494720 |
| 17 | -119133110016 |
| 18 | 2180339762688 |
| 19 | 46923057637632 |
| 20 | 368154762301440 |
| 21 | -2077357560938496 |
| 22 | -101408182152625152 |
| 23 | -1314869775259580928 |
| 24 | -1225663306833715200 |
[2,-1,-2,-3,0,24,108,162,-1440,-14256,-54432, 177552,4432320,31796064,10520928,-2531636208, -31078494720,-119133110016,2180339762688, 46923057637632,368154762301440,-2077357560938496, -101408182152625152,-1314869775259580928, -1225663306833715200] |