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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 77904 |
| 4 | 3106180802304 |
| 5 | 1013669737707471716851200 |
| 6 | 18968374334711770486769731248538772198400 |
| 7 | 11766533207621124571852752228412289168389531988430887478758400 |
[0,0,77904,3106180802304, 1013669737707471716851200, 18968374334711770486769731248538772198400, 11766533207621124571852752228412289168389531988430\ 887478758400] |