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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 91 |
| 3 | 66 |
| 4 | 340 |
| 5 | 2548 |
| 6 | 30940 |
| 7 | 67228 |
| 8 | 6290620 |
| 9 | 81818748 |
| 10 | 1336727934 |
| 11 | 19729482496 |
| 12 | 358398854656 |
| 13 | 1934923637500 |
| 14 | 115877891562496 |
[3,91,66,340,2548,30940,67228,6290620,81818748, 1336727934,19729482496,358398854656,1934923637500, 115877891562496] |