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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 67 |
| 3 | 4294 |
| 4 | 721939 |
| 5 | 459256128 |
| 6 | 1266938409578 |
| 7 | 13394202897232848 |
| 8 | 504070949140994691397 |
[3,67,4294,721939,459256128,1266938409578, 13394202897232848,504070949140994691397] |