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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 2584 |
| 3 | 234336 |
| 4 | 17726611 |
| 5 | 1454768048 |
| 6 | 118292347982 |
| 7 | 9669634711179 |
| 8 | 790105900385455 |
| 9 | 64578303092773705 |
| 10 | 5278241081510497850 |
| 11 | 431415634830501378047 |
| 12 | 35261742427088235238529 |
| 13 | 2882118653532747073628155 |
[81,2584,234336,17726611,1454768048,118292347982, 9669634711179,790105900385455,64578303092773705, 5278241081510497850,431415634830501378047, 35261742427088235238529,2882118653532747073628155] |