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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 4681 |
| 6 | 19477641 |
| 7 | 79936505481 |
| 8 | 327499862955657 |
| 9 | 1341480367403783817 |
| 10 | 5494724540479236953737 |
| 11 | 22506402447071849965115017 |
| 12 | 92186229916592298695053497993 |
| 13 | 377594800550975709003441429239433 |
| 14 | 1546628304496854696033468524851058313 |
[1,4681,19477641,79936505481,327499862955657, 1341480367403783817,5494724540479236953737, 22506402447071849965115017, 92186229916592298695053497993, 377594800550975709003441429239433, 1546628304496854696033468524851058313] |