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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 17 |
| 3 | 7849 |
| 4 | 3667649 |
| 5 | 2395420006033 |
| 6 | 3143661612445145 |
| 7 | 11877172892329028459041 |
| 8 | 32347093457545958193355601 |
| 9 | 424678439961073471604787362241217 |
[-1,17,7849,3667649,2395420006033, 3143661612445145,11877172892329028459041, 32347093457545958193355601, 424678439961073471604787362241217] |