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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 9 |
| 2 | 36 |
| 3 | 1260 |
| 4 | 908107200 |
| 5 | 43468142423564473939246248742562061499584000000 |
[3,9,36,1260,908107200, 43468142423564473939246248742562061499584000000] |