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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 672 |
| 3 | 1065960 |
| 4 | 5384957760 |
| 5 | 62421991632000 |
| 6 | 1384386516152640000 |
| 7 | 52302971661503603040000 |
| 8 | 3105288818333100374976000000 |
| 9 | 273018704366102767367501606400000 |
| 10 | 33963457896477610629976094607360000000 |
[3,672,1065960,5384957760,62421991632000, 1384386516152640000,52302971661503603040000, 3105288818333100374976000000, 273018704366102767367501606400000, 33963457896477610629976094607360000000] |