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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 97 |
| 4 | 1297 |
| 5 | 20961 |
| 6 | 398041 |
| 7 | 8678209 |
| 8 | 213337377 |
| 9 | 5830560577 |
| 10 | 175187949481 |
| 11 | 5734893998241 |
| 12 | 203021979225649 |
| 13 | 7724154592735777 |
| 14 | 314158263983430777 |
| 15 | 13597375157683820161 |
| 16 | 623802598335834369601 |
| 17 | 30228101725367033318529 |
| 18 | 1542430410234859308052297 |
[1,1,9,97,1297,20961,398041,8678209,213337377, 5830560577,175187949481,5734893998241, 203021979225649,7724154592735777, 314158263983430777,13597375157683820161, 623802598335834369601,30228101725367033318529, 1542430410234859308052297] |