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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 85 |
| 5 | 1071 |
| 6 | 16891 |
| 7 | 363378 |
| 8 | 9545369 |
| 9 | 279725995 |
| 10 | 9251279911 |
| 11 | 348363897498 |
| 12 | 14582418473041 |
| 13 | 666721363539674 |
| 14 | 33176394788669133 |
| 15 | 1789799842666045486 |
[1,1,7,85,1071,16891,363378,9545369,279725995, 9251279911,348363897498,14582418473041, 666721363539674,33176394788669133, 1789799842666045486] |