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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 470 |
| 3 | 6750 |
| 4 | 87411 |
| 5 | 1065177 |
| 6 | 12504280 |
| 7 | 143383500 |
| 8 | 1619764421 |
| 9 | 18123947127 |
| 10 | 201553821690 |
| 11 | 2232652225050 |
| 12 | 24669249375031 |
| 13 | 272138102501877 |
| 14 | 2998983086992700 |
| 15 | 33027209966147400 |
| 16 | 363568827451799241 |
[1,27,470,6750,87411,1065177,12504280,143383500, 1619764421,18123947127,201553821690,2232652225050, 24669249375031,272138102501877,2998983086992700, 33027209966147400,363568827451799241] |