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| n | a(n) |
|---|---|
| 3 | 4 |
| 4 | 19 |
| 5 | 708 |
| 6 | 434084 |
| 7 | 2241083208326 |
| 8 | 215756808230894177 |
| 9 | 2060566480104934403920300234585909787665 |
| 10 | 617615253014819903932289163457572353933923701758144 |
[4,19,708,434084,2241083208326,215756808230894177, 2060566480104934403920300234585909787665, 61761525301481990393228916345757235393392370175814\ 4] |