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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 87 |
| 4 | 1334 |
| 5 | 25045 |
| 6 | 529080 |
| 7 | 12076435 |
| 8 | 291307490 |
| 9 | 7325385345 |
| 10 | 190294925864 |
| 11 | 5074233846583 |
| 12 | 138240914882394 |
| 13 | 3834434331534781 |
| 14 | 107990908896551192 |
| 15 | 3081524055740420811 |
| 16 | 88938694296657330170 |
| 17 | 2592715751635344852505 |
| 18 | 76252823735941187830920 |
| 19 | 2260342454730542009915455 |
| 20 | 67476975730679069406101870 |
[1,8,87,1334,25045,529080,12076435,291307490, 7325385345,190294925864,5074233846583, 138240914882394,3834434331534781, 107990908896551192,3081524055740420811, 88938694296657330170,2592715751635344852505, 76252823735941187830920,2260342454730542009915455, 67476975730679069406101870] |