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| n | a(n) |
|---|---|
| 1 | 42 |
| 2 | 1764 |
| 3 | 6216 |
| 4 | 21904 |
| 5 | 48840 |
| 6 | 108900 |
| 7 | 198000 |
| 8 | 360000 |
| 9 | 582000 |
| 10 | 940900 |
| 11 | 1408440 |
| 12 | 2108304 |
| 13 | 2988216 |
| 14 | 4235364 |
| 15 | 5762400 |
| 16 | 7840000 |
| 17 | 10332000 |
| 18 | 13616100 |
| 19 | 17490600 |
| 20 | 22467600 |
| 21 | 28259880 |
| 22 | 35545444 |
| 23 | 43928016 |
| 24 | 54287424 |
| 25 | 66090960 |
| 26 | 80460900 |
| 27 | 96696600 |
[42,1764,6216,21904,48840,108900,198000,360000, 582000,940900,1408440,2108304,2988216,4235364, 5762400,7840000,10332000,13616100,17490600, 22467600,28259880,35545444,43928016,54287424, 66090960,80460900,96696600] |