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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 320 |
| 2 | 2300606464 |
| 3 | 289899537900576358400 |
| 4 | 614482906548854364363387716704247808 |
| 5 | 21564742087547836976004856537464240189331001616154755072 |
| 6 | 12433415382338420812828401445037903120443542018197863908895102595928462876835840 |
[1,320,2300606464,289899537900576358400, 614482906548854364363387716704247808, 21564742087547836976004856537464240189331001616154\ 755072, 12433415382338420812828401445037903120443542018197\ 863908895102595928462876835840] |