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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 54 |
| 2 | 1800 |
| 3 | 110250 |
| 4 | 10716300 |
| 5 | 1512784350 |
| 6 | 292183491600 |
| 7 | 73958946311250 |
| 8 | 23749039426612500 |
| 9 | 9430743556307823750 |
| 10 | 4537044990907363935000 |
| 11 | 2600104866872495148416250 |
| 12 | 1750070583471871734510937500 |
| 13 | 1366930130733208386919792968750 |
| 14 | 1226227455943070136959515612500000 |
[4,54,1800,110250,10716300,1512784350, 292183491600,73958946311250,23749039426612500, 9430743556307823750,4537044990907363935000, 2600104866872495148416250, 1750070583471871734510937500, 1366930130733208386919792968750, 1226227455943070136959515612500000] |