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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 10 |
| 6 | 10 |
| 7 | -105 |
| 8 | -1064 |
| 9 | -6076 |
| 10 | -16680 |
| 11 | 129525 |
| 12 | 2642860 |
| 13 | 25431406 |
| 14 | 130210444 |
| 15 | -639438345 |
| 16 | -26431524560 |
| 17 | -382074099000 |
| 18 | -3083015556624 |
| 19 | 5641134587049 |
| 20 | 726952330301940 |
| 21 | 14940678486798610 |
| 22 | 173111303303845060 |
| 23 | 258953439321230731 |
| 24 | -43858702741534022936 |
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