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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 576 |
| 5 | 1416960 |
| 6 | 120678543360 |
| 7 | 455010170456862720 |
| 8 | 95371866538619173904056320 |
| 9 | 1383866987105877308750365304858542080 |
| 10 | 1716187027583005555045945024371317843956845772800 |
| 11 | 221917018834976627508152930913765491170568412125060985539788800 |
| 12 | 3598055237740601485367382153175891099609454479883844294426214728495086488780800 |
[1,1,6,576,1416960,120678543360, 455010170456862720,95371866538619173904056320, 1383866987105877308750365304858542080, 1716187027583005555045945024371317843956845772800, 22191701883497662750815293091376549117056841212506\ 0985539788800, 35980552377406014853673821531758910996094544798838\ 44294426214728495086488780800] |