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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 67 |
| 3 | 187 |
| 4 | 1519 |
| 5 | 6367 |
| 6 | 59415 |
| 7 | 371227 |
| 8 | 3347259 |
| 9 | 25280899 |
| 10 | 217539879 |
| 11 | 1797387895 |
| 12 | 15157136755 |
| 13 | 126097221397 |
| 14 | 1042012762911 |
[7,67,187,1519,6367,59415,371227,3347259,25280899, 217539879,1797387895,15157136755,126097221397, 1042012762911] |