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A055746 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 20 |
| 4 | 2800 |
| 5 | 16464000 |
| 6 | 12778698240000 |
| 7 | 4254956888736153600000 |
| 8 | 2026001446509988558521630720000000 |
| 9 | 4690285643617101997210180025102660272128000000000 |
[1,1,2,20,2800,16464000,12778698240000, 4254956888736153600000, 2026001446509988558521630720000000, 4690285643617101997210180025102660272128000000000] |