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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 225 |
| 3 | 507375 |
| 4 | 11755976175 |
| 5 | 2834518121474625 |
| 6 | 7151051711514319493625 |
| 7 | 189393562987102056163761489375 |
[1,225,507375,11755976175,2834518121474625, 7151051711514319493625, 189393562987102056163761489375] |