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| n | a(n) |
|---|---|
| 2 | 9 |
| 3 | 144 |
| 4 | 3600 |
| 5 | 129600 |
| 6 | 6350400 |
| 7 | 406425600 |
| 8 | 32920473600 |
| 9 | 3292047360000 |
| 10 | 398337730560000 |
| 11 | 57360633200640000 |
| 12 | 9693947010908160000 |
| 13 | 1900013614137999360000 |
| 14 | 427503063181049856000000 |
| 15 | 109440784174348763136000000 |
| 16 | 31628386626386792546304000000 |
[9,144,3600,129600,6350400,406425600,32920473600, 3292047360000,398337730560000,57360633200640000, 9693947010908160000,1900013614137999360000, 427503063181049856000000, 109440784174348763136000000, 31628386626386792546304000000] |