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| n | a(n) |
|---|---|
| 1 | 42 |
| 2 | 1764 |
| 3 | 2520 |
| 4 | 21600 |
| 5 | 140032 |
| 6 | 794768 |
| 7 | 5346600 |
| 8 | 35345040 |
| 9 | 217844880 |
| 10 | 1406403632 |
| 11 | 9173045376 |
| 12 | 58174755912 |
| 13 | 372634101736 |
| 14 | 2407973848320 |
| 15 | 15409799757744 |
| 16 | 98700041311176 |
| 17 | 634975561066176 |
| 18 | 4073542031777904 |
| 19 | 26114933024294400 |
[42,1764,2520,21600,140032,794768,5346600, 35345040,217844880,1406403632,9173045376, 58174755912,372634101736,2407973848320, 15409799757744,98700041311176,634975561066176, 4073542031777904,26114933024294400] |