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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 120 |
| 3 | 60480 |
| 4 | 79833600 |
| 5 | 217945728000 |
| 6 | 1067062284288000 |
| 7 | 8515157028618240000 |
| 8 | 103408066955539906560000 |
| 9 | 1814811575069725360128000000 |
| 10 | 44208809968698509772718080000000 |
| 11 | 1447219603135314415919699066880000000 |
| 12 | 61998887798316869577999908025139200000000 |
[1,120,60480,79833600,217945728000, 1067062284288000,8515157028618240000, 103408066955539906560000, 1814811575069725360128000000, 44208809968698509772718080000000, 1447219603135314415919699066880000000, 61998887798316869577999908025139200000000] |