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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 36 |
| 3 | 777924 |
| 4 | 51190934086656 |
| 5 | 32435802373365731229926400 |
| 6 | 483207398728525904876601066508152707481600 |
| 7 | 350969035472356907726779584093506665415605824531908346799718400 |
[1,36,777924,51190934086656, 32435802373365731229926400, 483207398728525904876601066508152707481600, 35096903547235690772677958409350666541560582453190\ 8346799718400] |