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| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 28724 |
| 3 | 8381936 |
| 4 | 11786800328 |
| 5 | 101664965477840 |
| 6 | 4561749663096542724 |
| 7 | 995980221935339574016820 |
[256,28724,8381936,11786800328,101664965477840, 4561749663096542724,995980221935339574016820] |