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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 46 |
| 3 | 17694 |
| 4 | 57455502 |
| 5 | 1579646506770 |
| 6 | 368159933254055152 |
| 7 | 727800879295716577956574 |
[1,46,17694,57455502,1579646506770, 368159933254055152,727800879295716577956574] |