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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 9 |
| 6 | 731 |
| 7 | 6249886265 |
| 8 | 800859597553373777918076329400178 |
[1,1,1,1,2,9,731,6249886265, 800859597553373777918076329400178] |