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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 5 |
| 6 | 15 |
| 7 | 35 |
| 8 | 35 |
| 9 | -504 |
| 10 | -6090 |
| 11 | -45870 |
| 12 | -265155 |
| 13 | -990275 |
| 14 | 2733731 |
| 15 | 113064315 |
| 16 | 1571621870 |
| 17 | 15859846380 |
| 18 | 116145112140 |
| 19 | 289646855916 |
| 20 | -9965576133855 |
| 21 | -255337210989315 |
| 22 | -4024508801328785 |
| 23 | -47031887951290165 |
| 24 | -338016913616223534 |
| 25 | 1717029492398463650 |
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