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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 3420 |
| 3 | 40001698260 |
| 4 | 64008151994095341241755497070780 |
| 5 | 262244184463346778261182615794616508638576477409715732397097802610370956164308073990185129764340 |
[15,3420,40001698260, 64008151994095341241755497070780, 26224418446334677826118261579461650863857647740971\ 5732397097802610370956164308073990185129764340] |