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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 16 |
| 4 | 5760 |
| 5 | 26880 |
| 6 | 14515200 |
| 7 | 958003200 |
| 8 | 55794106368 |
| 9 | 41845579776000 |
| 10 | 25609494822912000 |
| 11 | 4865804016353280000 |
| 12 | 2997335274073620480000 |
| 13 | 1240896803466478878720000 |
| 14 | 537721948168807514112000000 |
| 15 | 26512029966235987869696000000 |
[1,2,8,16,5760,26880,14515200,958003200, 55794106368,41845579776000,25609494822912000, 4865804016353280000,2997335274073620480000, 1240896803466478878720000, 537721948168807514112000000, 26512029966235987869696000000] |