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| n | a(n) |
|---|---|
| 1 | 1639 |
| 2 | 166531 |
| 3 | 63961519 |
| 4 | 18120156500 |
| 5 | 5469574400477 |
| 6 | 1628795409782566 |
| 7 | 486439997897622259 |
| 8 | 145186363056322713567 |
| 9 | 43339017958528994310740 |
| 10 | 12936602480737955657135546 |
| 11 | 3861570524893536530703944116 |
[1639,166531,63961519,18120156500,5469574400477, 1628795409782566,486439997897622259, 145186363056322713567,43339017958528994310740, 12936602480737955657135546, 3861570524893536530703944116] |