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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 2700 |
| 3 | 567567000 |
| 4 | 101370917007360000 |
| 5 | 26995322179162164731904000000 |
| 6 | 16635639072295355604762223305031680000000000 |
| 7 | 34026881962001914598329145027742925521204742717440000000000000 |
[1,5,2700,567567000,101370917007360000, 26995322179162164731904000000, 16635639072295355604762223305031680000000000, 34026881962001914598329145027742925521204742717440\ 000000000000] |