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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 702 |
| 3 | 18252 |
| 4 | 474552 |
| 5 | 12338352 |
| 6 | 320797152 |
| 7 | 8340725601 |
| 8 | 216858856500 |
| 9 | 5638330032075 |
| 10 | 146596574673900 |
| 11 | 3811510781360100 |
| 12 | 99099276151168800 |
| 13 | 2576581071661350000 |
| 14 | 66991105048200214050 |
| 15 | 1741768658063341610625 |
[1,27,702,18252,474552,12338352,320797152, 8340725601,216858856500,5638330032075, 146596574673900,3811510781360100, 99099276151168800,2576581071661350000, 66991105048200214050,1741768658063341610625] |