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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 13 |
| 5 | 37 |
| 6 | 73 |
| 7 | 777 |
| 8 | 9141 |
| 9 | 72173 |
| 10 | 857297 |
| 11 | 18077297 |
| 12 | 462703693 |
| 13 | 12835269909 |
| 14 | 499538698537 |
| 15 | 27296320407513 |
| 16 | 1893299363272421 |
| 17 | 164544756777460349 |
[1,13,37,73,777,9141,72173,857297,18077297, 462703693,12835269909,499538698537,27296320407513, 1893299363272421,164544756777460349] |