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| n | a(n) |
|---|---|
| 1 | 4084080 |
| 2 | 17907120 |
| 3 | 73513440 |
| 4 | 75675600 |
| 5 | 220540320 |
| 6 | 411863760 |
| 7 | 1102701600 |
| 8 | 1210809600 |
| 9 | 2162049120 |
| 10 | 2205403200 |
| 11 | 2327925600 |
| 12 | 2471182560 |
| 13 | 3087564480 |
| 14 | 5145940800 |
| 15 | 6983776800 |
| 16 | 8380532160 |
| 17 | 9777287520 |
| 18 | 10291881600 |
| 19 | 10296594000 |
| 20 | 19554575040 |
| 21 | 20583763200 |
| 22 | 20593188000 |
[4084080,17907120,73513440,75675600,220540320, 411863760,1102701600,1210809600,2162049120, 2205403200,2327925600,2471182560,3087564480, 5145940800,6983776800,8380532160,9777287520, 10291881600,10296594000,19554575040,20583763200, 20593188000] |