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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1404 |
| 2 | 280854 |
| 3 | 19014840 |
| 4 | 581257404 |
| 5 | 9436118328 |
| 6 | 93086496360 |
| 7 | 638406025200 |
| 8 | 3387901252374 |
| 9 | 14765641285044 |
| 10 | 55108831380408 |
| 11 | 181434042582840 |
| 12 | 538265644820280 |
| 13 | 1464212332875816 |
| 14 | 3696677780664960 |
| 15 | 8759016189382896 |
| 16 | 19620550996489404 |
| 17 | 41872709357187696 |
[1,1404,280854,19014840,581257404,9436118328, 93086496360,638406025200,3387901252374, 14765641285044,55108831380408,181434042582840, 538265644820280,1464212332875816,3696677780664960, 8759016189382896,19620550996489404, 41872709357187696] |