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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | -1358 |
| 3 | -84996 |
| 4 | 5322540 |
| 5 | 667658808 |
| 6 | -32744702856 |
| 7 | -7327417341744 |
| 8 | 253642619275152 |
| 9 | 103163294897460000 |
| 10 | -1982702662432970976 |
| 11 | -1770895268099070677568 |
| 12 | 4807849834551556801728 |
| 13 | 35830291388333570578463616 |
| 14 | 539816800507699929385760640 |
[1,18,-1358,-84996,5322540,667658808,-32744702856, -7327417341744,253642619275152,103163294897460000, -1982702662432970976,-1770895268099070677568, 4807849834551556801728,35830291388333570578463616, 539816800507699929385760640] |