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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -24 |
| 4 | 20 |
| 5 | -112 |
| 6 | 500 |
| 7 | -4312 |
| 8 | 780 |
| 9 | -189728 |
| 10 | 103428 |
| 11 | -643720 |
| 12 | 586092 |
| 13 | -16074608 |
| 14 | 63493300 |
| 15 | -3882017832 |
| 16 | 17704862500 |
| 17 | -112528101312 |
| 18 | 349139888500 |
| 19 | -832452204024 |
| 20 | 11690656900 |
| 21 | -3884776952112 |
| 22 | 1364209732100 |
| 23 | -306249916391496 |
| 24 | 279662995080500 |
| 25 | -1531060188069792 |
[1,1,-24,20,-112,500,-4312,780,-189728,103428, -643720,586092,-16074608,63493300,-3882017832, 17704862500,-112528101312,349139888500, -832452204024,11690656900,-3884776952112, 1364209732100,-306249916391496,279662995080500, -1531060188069792] |