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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 17 |
| 3 | 121 |
| 4 | 965 |
| 5 | 8247 |
| 6 | 73841 |
| 7 | 683713 |
| 8 | 6493145 |
| 9 | 62898859 |
| 10 | 619079889 |
| 11 | 6173490857 |
| 12 | 62239144525 |
| 13 | 633323532783 |
| 14 | 6496052173665 |
| 15 | 67093423506049 |
| 16 | 697181754821297 |
| 17 | 7283521984427283 |
| 18 | 76455801614169809 |
| 19 | 806004056649062937 |
| 20 | 8529783421905380629 |
| 21 | 90584730265930813607 |
[1,3,17,121,965,8247,73841,683713,6493145, 62898859,619079889,6173490857,62239144525, 633323532783,6496052173665,67093423506049, 697181754821297,7283521984427283, 76455801614169809,806004056649062937, 8529783421905380629,90584730265930813607] |