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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1456 |
| 3 | 15480 |
| 4 | 114660 |
| 5 | 2244600 |
| 6 | 3894768 |
| 7 | 25108200 |
| 8 | 27052704 |
| 9 | 65021040 |
| 10 | 112402080 |
| 11 | 1973921400 |
[1,1456,15480,114660,2244600,3894768,25108200, 27052704,65021040,112402080,1973921400] |