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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 4116 |
| 4 | 2826802944 |
| 5 | 33920193794185101312 |
| 6 | 110137716338572837381278474323361792 |
| 7 | 1523742153535218423780156082312357202968690791891031031808 |
[1,7,4116,2826802944,33920193794185101312, 110137716338572837381278474323361792, 15237421535352184237801560823123572029686907918910\ 31031808] |