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| n | a(n) |
|---|---|
| 1 | 729 |
| 2 | 20216 |
| 3 | 117386 |
| 4 | 388598 |
| 5 | 984595 |
| 6 | 2160036 |
| 7 | 4368458 |
| 8 | 8412641 |
| 9 | 15703623 |
| 10 | 28693082 |
| 11 | 51589943 |
| 12 | 91524689 |
| 13 | 160402902 |
| 14 | 277798382 |
| 15 | 475383309 |
| 16 | 803588211 |
| 17 | 1341439640 |
| 18 | 2210851797 |
| 19 | 3597065144 |
| 20 | 5777447600 |
| 21 | 9161521721 |
| 22 | 14345876103 |
[729,20216,117386,388598,984595,2160036,4368458, 8412641,15703623,28693082,51589943,91524689, 160402902,277798382,475383309,803588211, 1341439640,2210851797,3597065144,5777447600, 9161521721,14345876103] |