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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 224 |
| 3 | 168960 |
| 4 | 1705639936 |
| 5 | 229940737867776 |
| 6 | 413561647491497066496 |
| 7 | 9918120959299139713735065600 |
[4,224,168960,1705639936,229940737867776, 413561647491497066496, 9918120959299139713735065600] |