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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 80 |
| 6 | 7040 |
| 7 | 878080 |
| 8 | 169967616 |
| 9 | 53247344640 |
| 10 | 27580935700480 |
| 11 | 23884321532149760 |
| 12 | 34771166607668412416 |
| 13 | 85316631064301031915520 |
| 14 | 353171748158258855521812480 |
| 15 | 2467057266045387831319241687040 |
| 16 | 29078599995993904385498084987109376 |
[0,0,0,1,80,7040,878080,169967616,53247344640, 27580935700480,23884321532149760, 34771166607668412416,85316631064301031915520, 353171748158258855521812480, 2467057266045387831319241687040, 29078599995993904385498084987109376] |