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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 48 |
| 4 | 31328 |
| 5 | 473555616 |
| 6 | 155337138737984 |
| 7 | 1070159970425515438368 |
| 8 | 152060635426686819239358391520 |
| 9 | 440726752780548858707046038903585268960 |
| 10 | 25867445082047583284454362951686346866758358099808 |
[1,2,48,31328,473555616,155337138737984, 1070159970425515438368, 152060635426686819239358391520, 440726752780548858707046038903585268960, 25867445082047583284454362951686346866758358099808\ ] |