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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | -4 |
| 4 | 56 |
| 5 | 177 |
| 6 | 25 |
| 7 | -248 |
| 8 | 1536 |
| 9 | 19448 |
| 10 | 10025 |
| 11 | 2313 |
| 12 | -78584 |
| 13 | 1525084 |
| 14 | 2046000 |
| 15 | 1990649 |
| 16 | -12721279 |
| 17 | 80406480 |
| 18 | 282880000 |
| 19 | 276053680 |
| 20 | -672007599 |
| 21 | 1449521681 |
| 22 | 28914914000 |
| 23 | 32747999676 |
| 24 | 14429332456 |
| 25 | -221875825343 |
[1,1,0,-4,56,177,25,-248,1536,19448,10025,2313, -78584,1525084,2046000,1990649,-12721279,80406480, 282880000,276053680,-672007599,1449521681, 28914914000,32747999676,14429332456,-221875825343] |