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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | -926 |
| 3 | -61668 |
| 4 | 2362476 |
| 5 | 350864568 |
| 6 | -8449912776 |
| 7 | -2783582689968 |
| 8 | 23832248370576 |
| 9 | 28264807370350368 |
| 10 | 240653738497326624 |
| 11 | -348978324836427720768 |
| 12 | -9590598751393940053824 |
| 13 | 5062044095021324890551168 |
| 14 | 246964023420535373904561024 |
| 15 | -84140419241303548854363341568 |
[1,18,-926,-61668,2362476,350864568,-8449912776, -2783582689968,23832248370576,28264807370350368, 240653738497326624,-348978324836427720768, -9590598751393940053824,5062044095021324890551168, 246964023420535373904561024, -84140419241303548854363341568] |