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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 72 |
| 2 | 419904 |
| 3 | 198359290368 |
| 4 | 7589970693537140736 |
| 5 | 23524081260686625628823519232 |
| 6 | 5905684770308534937017423724484399202304 |
| 7 | 120091666484242114100641836801136909254418910442160128 |
[1,72,419904,198359290368,7589970693537140736, 23524081260686625628823519232, 5905684770308534937017423724484399202304, 12009166648424211410064183680113690925441891044216\ 0128] |