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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 673072 |
| 5 | 24674450670 |
| 6 | 47695073906240 |
| 7 | 16222886703881375 |
| 8 | 1842996310592836896 |
| 9 | 98798502888215704812 |
| 10 | 3068393794369671728640 |
| 11 | 62960689505171989129005 |
| 12 | 933100312771109288146000 |
| 13 | 10639781342848431789710266 |
| 14 | 97779035987698387480546752 |
| 15 | 750090455960001686602653035 |
[1,673072,24674450670,47695073906240, 16222886703881375,1842996310592836896, 98798502888215704812,3068393794369671728640, 62960689505171989129005,933100312771109288146000, 10639781342848431789710266, 97779035987698387480546752, 750090455960001686602653035] |