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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 24 |
| 4 | 288 |
| 5 | 6912 |
| 6 | 165888 |
| 7 | 7962624 |
| 8 | 382205952 |
| 9 | 27518828544 |
| 10 | 1981355655168 |
| 11 | 237762678620160 |
| 12 | 22825217147535360 |
| 13 | 3834636480785940480 |
| 14 | 552187653233175429120 |
| 15 | 106020029420769682391040 |
| 16 | 20355845648787779019079680 |
| 17 | 5862483546850880357494947840 |
[1,3,24,288,6912,165888,7962624,382205952, 27518828544,1981355655168,237762678620160, 22825217147535360,3834636480785940480, 552187653233175429120,106020029420769682391040, 20355845648787779019079680, 5862483546850880357494947840] |