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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 96 |
| 3 | 11904 |
| 4 | 7428096 |
| 5 | 23205371904 |
| 6 | 362560730628096 |
| 7 | 28324694519589371904 |
| 8 | 11064305472020078810628096 |
| 9 | 21609960560733744406929189371904 |
| 10 | 211034749490954911990173458030810628096 |
[1,4,96,11904,7428096,23205371904,362560730628096, 28324694519589371904,11064305472020078810628096, 21609960560733744406929189371904, 211034749490954911990173458030810628096] |