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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 189 |
| 4 | 26254935 |
| 5 | 392654823152462915625 |
| 6 | 28032331438680332717218961936012273854096893310546875 |
[1,3,189,26254935,392654823152462915625, 28032331438680332717218961936012273854096893310546\ 875] |