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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 6 |
| 3 | -36 |
| 4 | -216 |
| 5 | 1296 |
| 6 | -5184 |
| 7 | -145152 |
| 8 | -3856896 |
| 9 | -170325504 |
| 10 | -6133211136 |
| 11 | 1094593056768 |
| 12 | 26742290558976 |
| 13 | -497681937801216 |
| 14 | -14357497419546624 |
| 15 | 657148066947072000 |
| 16 | 12008320398059765760 |
| 17 | 1322255096225695531008 |
| 18 | 70546799432003423698944 |
| 19 | -6537119853797882157072384 |
| 20 | -27940593871362459110473728 |
[3,6,-36,-216,1296,-5184,-145152,-3856896, -170325504,-6133211136,1094593056768, 26742290558976,-497681937801216, -14357497419546624,657148066947072000, 12008320398059765760,1322255096225695531008, 70546799432003423698944, -6537119853797882157072384, -27940593871362459110473728] |