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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 224 |
| 4 | 55528 |
| 5 | 172856160 |
| 6 | 8062329832848 |
| 7 | 6639540860396371968 |
| 8 | 111392882523018179554811904 |
| 9 | 43155882557276614860795848294400000 |
| 10 | 431558824501993007074816469828058115276800000 |
| 11 | 123128769173701666727732924444625440015971414494412800000 |
[1,2,9,224,55528,172856160,8062329832848, 6639540860396371968,111392882523018179554811904, 43155882557276614860795848294400000, 431558824501993007074816469828058115276800000, 12312876917370166672773292444462544001597141449441\ 2800000] |