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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 127 |
| 4 | 2601 |
| 5 | 70981 |
| 6 | 2433673 |
| 7 | 100697787 |
| 8 | 4886085137 |
| 9 | 272168650441 |
| 10 | 17121437245161 |
| 11 | 1200717094233559 |
| 12 | 92892754255837561 |
| 13 | 7859587210132504653 |
| 14 | 721996671783802854377 |
| 15 | 71564871858940414914451 |
| 16 | 7613407794191946986893857 |
| 17 | 865285095267929315207801233 |
[1,1,9,127,2601,70981,2433673,100697787, 4886085137,272168650441,17121437245161, 1200717094233559,92892754255837561, 7859587210132504653,721996671783802854377, 71564871858940414914451,7613407794191946986893857, 865285095267929315207801233] |