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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 702 |
| 3 | 18252 |
| 4 | 474552 |
| 5 | 12338352 |
| 6 | 320797152 |
| 7 | 8340725952 |
| 8 | 216858874752 |
| 9 | 5638330743552 |
| 10 | 146596599332352 |
| 11 | 3811511582641152 |
| 12 | 99099301148669952 |
| 13 | 2576581829865418752 |
| 14 | 66991127576500887552 |
| 15 | 1741769316989023076352 |
[1,27,702,18252,474552,12338352,320797152, 8340725952,216858874752,5638330743552, 146596599332352,3811511582641152, 99099301148669952,2576581829865418752, 66991127576500887552,1741769316989023076352] |