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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 72 |
| 4 | 162000 |
| 5 | 34907788800 |
| 6 | 1178106009360998400 |
| 7 | 8852509935316882311338419200 |
| 8 | 20266951127950378632425380239663945561600 |
| 9 | 18451222767137832036294073367248809725255450206074566400 |
| 10 | 8461986175729341705763214274355536481199826590348664142270203923137228800 |
[1,1,2,72,162000,34907788800,1178106009360998400, 8852509935316882311338419200, 20266951127950378632425380239663945561600, 18451222767137832036294073367248809725255450206074\ 566400, 84619861757293417057632142743555364811998265903486\ 64142270203923137228800] |