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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 141 |
| 3 | 68575 |
| 4 | 32089377154 |
| 5 | 1644444237306316731482 |
| 6 | 65593236350142721999718859354569312622907814 |
[2,5,141,68575,32089377154,1644444237306316731482, 65593236350142721999718859354569312622907814] |