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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 21 |
| 3 | 93 |
| 4 | 381 |
| 5 | 24573 |
| 6 | 393213 |
| 7 | 1572861 |
| 8 | 6442450941 |
| 9 | 6917529027641081853 |
| 10 | 1856910058928070412348686333 |
| 11 | 486777830487640090174734030864381 |
| 12 | 510423550381407695195061911147652317181 |
[9,21,93,381,24573,393213,1572861,6442450941, 6917529027641081853,1856910058928070412348686333, 486777830487640090174734030864381, 510423550381407695195061911147652317181] |