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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 4 |
| 5 | 16 |
| 6 | 65536 |
| 7 | 115792089237316195423570985008687907853269984665640564039457584007913129639936 |
[1,2,2,4,16,65536, 11579208923731619542357098500868790785326998466564\ 0564039457584007913129639936] |