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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 10 |
| 4 | 900 |
| 5 | 647520 |
| 6 | 4779786496 |
| 7 | 478835488935936 |
| 8 | 751143210488064000000 |
| 9 | 21219054324352295044090429440 |
| 10 | 12058466910590476741745310502905446400 |
| 11 | 152894149853918130236030979823862137011289718784 |
| 12 | 47493814580095591414083394894826323264052517057498653392896 |
[1,1,10,900,647520,4779786496,478835488935936, 751143210488064000000, 21219054324352295044090429440, 12058466910590476741745310502905446400, 152894149853918130236030979823862137011289718784, 47493814580095591414083394894826323264052517057498\ 653392896] |