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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 560 |
| 3 | 277200 |
| 4 | 369969600 |
| 5 | 1040623584000 |
| 6 | 5318844410880000 |
| 7 | 44743448895425280000 |
| 8 | 577102758498249984000000 |
| 9 | 10821132329283106871040000000 |
| 10 | 283002122589833107696435200000000 |
| 11 | 9986037506585076241055342592000000000 |
| 12 | 462684151212030123561950840428953600000000 |
[1,5,560,277200,369969600,1040623584000, 5318844410880000,44743448895425280000, 577102758498249984000000, 10821132329283106871040000000, 283002122589833107696435200000000, 9986037506585076241055342592000000000, 462684151212030123561950840428953600000000] |