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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 5 |
| 3 | 24 |
| 4 | 768 |
| 5 | 4862 |
| 6 | 99088 |
| 7 | 11604117 |
| 8 | 241988291 |
| 9 | 24508598458 |
| 10 | 14166568176196 |
[1,15,5,24,768,4862,99088,11604117,241988291, 24508598458,14166568176196] |