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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 648 |
| 3 | 16245 |
| 4 | 442890 |
| 5 | 13269069 |
| 6 | 437085705 |
| 7 | 15779515035 |
| 8 | 621549547326 |
| 9 | 26584365342579 |
| 10 | 1228849871633643 |
| 11 | 61116983784901476 |
| 12 | 3257058909552139683 |
| 13 | 185287271910574343301 |
| 14 | 11212875913429712533737 |
| 15 | 719555515466643129103760 |
[1,27,648,16245,442890,13269069,437085705, 15779515035,621549547326,26584365342579, 1228849871633643,61116983784901476, 3257058909552139683,185287271910574343301, 11212875913429712533737,719555515466643129103760] |