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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 8 |
| 3 | 180 |
| 4 | 32 |
| 5 | 10080 |
| 6 | 3456 |
| 7 | 453600 |
| 8 | 115200 |
| 9 | 47900160 |
| 10 | 71680 |
| 11 | 217945728000 |
| 12 | 36578304000 |
| 13 | 2241727488000 |
| 14 | 45984153600 |
| 15 | 2000741783040000 |
[1,6,8,180,32,10080,3456,453600,115200,47900160, 71680,217945728000,36578304000,2241727488000, 45984153600,2000741783040000] |