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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 43 |
| 4 | 647 |
| 5 | 22049 |
| 6 | 1455385 |
| 7 | 218691097 |
| 8 | 72877697369 |
| 9 | 51489351108548 |
| 10 | 76986419992442614 |
| 11 | 244445556617038272066 |
| 12 | 1683765308911934025295376 |
[2,5,43,647,22049,1455385,218691097,72877697369, 51489351108548,76986419992442614, 244445556617038272066,1683765308911934025295376] |