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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 1500 |
| 3 | 74250000 |
| 4 | 1176120000000000 |
| 5 | 9780613920000000000000000 |
| 6 | 63441756579801600000000000000000000000 |
| 7 | 446492348463430358369280000000000000000000000000000000 |
[1,5,1500,74250000,1176120000000000, 9780613920000000000000000, 63441756579801600000000000000000000000, 44649234846343035836928000000000000000000000000000\ 0000] |