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A165638 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | -24 |
| 3 | 156 |
| 4 | -924 |
| 5 | 5556 |
| 6 | -33324 |
| 7 | 199956 |
| 8 | -1199724 |
| 9 | 7198356 |
| 10 | -43190124 |
| 11 | 259140756 |
| 12 | -1554844524 |
| 13 | 9329067156 |
| 14 | -55974402924 |
| 15 | 335846417556 |
| 16 | -2015078505324 |
| 17 | 12090471031956 |
| 18 | -72542826191724 |
| 19 | 435256957150356 |
[1,6,-24,156,-924,5556,-33324,199956,-1199724, 7198356,-43190124,259140756,-1554844524, 9329067156,-55974402924,335846417556, -2015078505324,12090471031956,-72542826191724, 435256957150356] |