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| n | a(n) |
|---|---|
| 1 | 672 |
| 2 | 30240 |
| 3 | 32760 |
| 4 | 2178540 |
| 5 | 23569920 |
| 6 | 45532800 |
| 7 | 142990848 |
| 8 | 459818240 |
| 9 | 1379454720 |
| 10 | 14182439040 |
| 11 | 43861478400 |
| 12 | 51001180160 |
| 13 | 66433720320 |
| 14 | 153003540480 |
| 15 | 403031236608 |
| 16 | 704575228896 |
| 17 | 13661860101120 |
| 18 | 181742883469056 |
| 19 | 6088728021160320 |
| 20 | 14942123276641920 |
| 21 | 20158185857531904 |
[672,30240,32760,2178540,23569920,45532800, 142990848,459818240,1379454720,14182439040, 43861478400,51001180160,66433720320,153003540480, 403031236608,704575228896,13661860101120, 181742883469056,6088728021160320, 14942123276641920,20158185857531904] |