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| n | a(n) |
|---|---|
| 1 | 36 |
| 2 | 576 |
| 3 | 3600 |
| 4 | 14400 |
| 5 | 112896 |
| 6 | 254016 |
| 7 | 518400 |
| 8 | 1742400 |
| 9 | 4769856 |
| 10 | 16646400 |
| 11 | 23970816 |
| 12 | 46785600 |
| 13 | 147476736 |
| 14 | 243360000 |
| 15 | 386358336 |
| 16 | 593409600 |
| 17 | 885657600 |
| 18 | 1071645696 |
| 19 | 2561979456 |
| 20 | 4744454400 |
| 21 | 6314527296 |
[36,576,3600,14400,112896,254016,518400,1742400, 4769856,16646400,23970816,46785600,147476736, 243360000,386358336,593409600,885657600, 1071645696,2561979456,4744454400,6314527296] |