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| n | a(n) |
|---|---|
| 1 | 27 |
| 2 | 588 |
| 3 | 12900 |
| 4 | 282672 |
| 5 | 6195480 |
| 6 | 135783240 |
| 7 | 2975926392 |
| 8 | 65222436072 |
| 9 | 1429460497272 |
| 10 | 31329049201704 |
| 11 | 686629243183416 |
| 12 | 15048644047773288 |
| 13 | 329816550981847032 |
| 14 | 7228488945306025128 |
| 15 | 158424591792311309496 |
[27,588,12900,282672,6195480,135783240,2975926392, 65222436072,1429460497272,31329049201704, 686629243183416,15048644047773288, 329816550981847032,7228488945306025128, 158424591792311309496] |