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| n | a(n) |
|---|---|
| 1 | 54 |
| 2 | 13824 |
| 3 | 354294 |
| 4 | 3538944 |
| 5 | 21093750 |
| 6 | 90699264 |
| 7 | 311299254 |
| 8 | 905969664 |
| 9 | 2324522934 |
| 10 | 5400000000 |
| 11 | 11575379574 |
| 12 | 23219011584 |
| 13 | 44049458934 |
| 14 | 79692609024 |
| 15 | 138396093750 |
| 16 | 231928233984 |
| 17 | 376690901814 |
| 18 | 595077871104 |
| 19 | 917112404214 |
[54,13824,354294,3538944,21093750,90699264, 311299254,905969664,2324522934,5400000000, 11575379574,23219011584,44049458934,79692609024, 138396093750,231928233984,376690901814, 595077871104,917112404214] |