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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 2400 |
| 4 | 6375600 |
| 5 | 45927907200 |
| 6 | 713518388352000 |
| 7 | 21216194909362252800 |
| 8 | 1105729617210350356224000 |
| 9 | 94398452626533646953922560000 |
| 10 | 12514511465855205467497303154688000 |
| 11 | 2467490887755897725667792936979169280000 |
| 12 | 698323914872709997998407130752506728284160000 |
[0,6,2400,6375600,45927907200,713518388352000, 21216194909362252800,1105729617210350356224000, 94398452626533646953922560000, 12514511465855205467497303154688000, 2467490887755897725667792936979169280000, 698323914872709997998407130752506728284160000] |