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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -4 |
| 2 | 36 |
| 3 | -544 |
| 4 | 12000 |
| 5 | -353016 |
| 6 | 13024690 |
| 7 | -578027008 |
| 8 | 29965705056 |
| 9 | -1776380879600 |
| 10 | 118487748235604 |
| 11 | -8781184406967264 |
| 12 | 715759620936227036 |
| 13 | -63634560244855290488 |
| 14 | 6127715132571003255000 |
| 15 | -635341671628285381320704 |
| 16 | 70567080867797749860480968 |
| 17 | -8358996420744136578157248864 |
| 18 | 1051888164647093035820630830470 |
| 19 | -140135781917815169726696222119200 |
| 20 | 19704058040921706609228103696785954 |
[1,-4,36,-544,12000,-353016,13024690,-578027008, 29965705056,-1776380879600,118487748235604, -8781184406967264,715759620936227036, -63634560244855290488,6127715132571003255000, -635341671628285381320704, 70567080867797749860480968, -8358996420744136578157248864, 1051888164647093035820630830470, -140135781917815169726696222119200, 19704058040921706609228103696785954] |