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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | -10 |
| 6 | 85 |
| 7 | -735 |
| 8 | 6734 |
| 9 | -66024 |
| 10 | 693230 |
| 11 | -7774250 |
| 12 | 92759821 |
| 13 | -1172483598 |
| 14 | 15630569591 |
| 15 | -218793782025 |
| 16 | 3201481037819 |
| 17 | -48746860400024 |
| 18 | 768683653934928 |
| 19 | -12487871805640344 |
| 20 | 207761719406853466 |
| 21 | -3513910668343842900 |
| 22 | 59833161662103132050 |
| 23 | -1011244718827893629750 |
[1,-10,85,-735,6734,-66024,693230,-7774250, 92759821,-1172483598,15630569591,-218793782025, 3201481037819,-48746860400024,768683653934928, -12487871805640344,207761719406853466, -3513910668343842900,59833161662103132050, -1011244718827893629750] |