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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 97 |
| 3 | 1027 |
| 4 | 9601 |
| 5 | 84031 |
| 6 | 705889 |
| 7 | 5764795 |
| 8 | 46118401 |
| 9 | 363182455 |
| 10 | 2824752481 |
| 11 | 21750594163 |
| 12 | 166095446401 |
| 13 | 1259557135279 |
| 14 | 9495123019873 |
| 15 | 71213422649131 |
| 16 | 531726889113601 |
| 17 | 3954718737782503 |
| 18 | 29311444762388065 |
| 19 | 216579008522089699 |
| 20 | 1595845325952240001 |
| 21 | 11729463145748964127 |
[1,7,97,1027,9601,84031,705889,5764795,46118401, 363182455,2824752481,21750594163,166095446401, 1259557135279,9495123019873,71213422649131, 531726889113601,3954718737782503, 29311444762388065,216579008522089699, 1595845325952240001,11729463145748964127] |