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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 576 |
| 4 | 10368 |
| 5 | 186624 |
| 6 | 2856816 |
| 7 | 43731769 |
| 8 | 696507612 |
| 9 | 11093144976 |
| 10 | 178795599948 |
| 11 | 2881767670929 |
| 12 | 45735094197492 |
| 13 | 725838818428816 |
| 14 | 11506986415823456 |
| 15 | 182424435028933696 |
| 16 | 2894261482434465920 |
[0,0,576,10368,186624,2856816,43731769,696507612, 11093144976,178795599948,2881767670929, 45735094197492,725838818428816,11506986415823456, 182424435028933696,2894261482434465920] |