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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 143 |
| 4 | 1133 |
| 5 | 2171 |
| 6 | 8567 |
| 7 | 16805 |
| 8 | 208091 |
| 9 | 1887043 |
| 10 | 517295383 |
| 11 | 878436591673 |
[1,5,143,1133,2171,8567,16805,208091,1887043, 517295383,878436591673] |