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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 240 |
| 2 | 205920 |
| 3 | 243443200 |
| 4 | 333578044800 |
| 5 | 497645070354432 |
| 6 | 784620394258821120 |
| 7 | 1286100339771928412160 |
| 8 | 2169691463830861104076800 |
| 9 | 3742512413364745240724275200 |
| 10 | 6570354792903146744615537541120 |
[1,240,205920,243443200,333578044800, 497645070354432,784620394258821120, 1286100339771928412160,2169691463830861104076800, 3742512413364745240724275200, 6570354792903146744615537541120] |