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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 432 |
| 3 | 303264 |
| 4 | 1965150720 |
| 5 | 115562653240320 |
| 6 | 61330486826476707840 |
| 7 | 293207687471256968260730880 |
| 8 | 12619705781992895315056778792140800 |
| 9 | 4888884191426907931326620039839052385484800 |
[1,6,432,303264,1965150720,115562653240320, 61330486826476707840,293207687471256968260730880, 12619705781992895315056778792140800, 4888884191426907931326620039839052385484800] |