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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 48 |
| 4 | 4480 |
| 5 | 2887680 |
| 6 | 5373624320 |
| 7 | 44196975083520 |
| 8 | 1442855588252876800 |
| 9 | 188570467779447305011200 |
| 10 | 98800579402758985681259724800 |
| 11 | 207089099087390763078860569942425600 |
[0,2,48,4480,2887680,5373624320,44196975083520, 1442855588252876800,188570467779447305011200, 98800579402758985681259724800, 207089099087390763078860569942425600] |