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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 16 |
| 6 | 165112971264 |
| 7 | 7081067777179913483347996561235301491807900639024696524800000000000000000000 |
[1,1,1,1,16,165112971264, 70810677771799134833479965612353014918079006390246\ 96524800000000000000000000] |