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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 48 |
| 2 | 1280 |
| 3 | 28672 |
| 4 | 589824 |
| 5 | 11534336 |
| 6 | 218103808 |
| 7 | 4026531840 |
| 8 | 73014444032 |
| 9 | 1305670057984 |
| 10 | 23089744183296 |
| 11 | 404620279021568 |
| 12 | 7036874417766400 |
| 13 | 121597189939003392 |
| 14 | 2089670227099910144 |
| 15 | 35740566642812256256 |
| 16 | 608742554432415203328 |
| 17 | 10330176681277348904960 |
[1,48,1280,28672,589824,11534336,218103808, 4026531840,73014444032,1305670057984, 23089744183296,404620279021568,7036874417766400, 121597189939003392,2089670227099910144, 35740566642812256256,608742554432415203328, 10330176681277348904960] |