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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 13 |
| 3 | 159 |
| 4 | 33337 |
| 5 | 2147648859 |
| 6 | 9223372049740171909 |
| 7 | 170141183460469231796250908018965844535 |
| 8 | 57896044618658097711785492504343953927996121800504035873840544850835832773873 |
[1,3,13,159,33337,2147648859,9223372049740171909, 170141183460469231796250908018965844535, 57896044618658097711785492504343953927996121800504\ 035873840544850835832773873] |