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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 27 |
| 3 | 405 |
| 4 | 1458 |
| 5 | 5103 |
| 6 | 59049 |
| 7 | 196830 |
| 8 | 649539 |
| 9 | 6908733 |
| 10 | 22320522 |
| 11 | 71744535 |
| 12 | 731794257 |
| 13 | 2324522934 |
| 14 | 7360989291 |
| 15 | 73222472421 |
| 16 | 230127770466 |
| 17 | 721764371007 |
| 18 | 7060738412025 |
| 19 | 22029503845518 |
| 20 | 68630377364883 |
| 21 | 663426981193869 |
[1,6,27,405,1458,5103,59049,196830,649539,6908733, 22320522,71744535,731794257,2324522934,7360989291, 73222472421,230127770466,721764371007, 7060738412025,22029503845518,68630377364883, 663426981193869] |