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| n | a(n) |
|---|---|
| 3 | 10 |
| 4 | 840 |
| 5 | 257040 |
| 6 | 137260200 |
| 7 | 118273755600 |
| 8 | 154712104747200 |
| 9 | 292311804557572800 |
| 10 | 766931112143320924800 |
| 11 | 2706462791802644002128000 |
| 12 | 12512595130808078973370704000 |
| 13 | 74130965352250071944327288640000 |
| 14 | 552334353713465817349513210512960000 |
| 15 | 5092566798555894395129552704613028960000 |
[10,840,257040,137260200,118273755600, 154712104747200,292311804557572800, 766931112143320924800,2706462791802644002128000, 12512595130808078973370704000, 74130965352250071944327288640000, 552334353713465817349513210512960000, 5092566798555894395129552704613028960000] |