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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 85 |
| 3 | 1437 |
| 4 | 26707 |
| 5 | 534513 |
| 6 | 11255951 |
| 7 | 245612031 |
| 8 | 5503639327 |
| 9 | 125900330437 |
| 10 | 2928092906281 |
| 11 | 69026845135479 |
| 12 | 1645689594867257 |
| 13 | 39611576627651927 |
| 14 | 961279033420170871 |
| 15 | 23494000801494204647 |
| 16 | 577777092945262623161 |
| 17 | 14287061769367391787065 |
| 18 | 355010279665452190629001 |
[1,7,85,1437,26707,534513,11255951,245612031, 5503639327,125900330437,2928092906281, 69026845135479,1645689594867257,39611576627651927, 961279033420170871,23494000801494204647, 577777092945262623161,14287061769367391787065, 355010279665452190629001] |