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| n | a(n) |
|---|---|
| 6 | 1485 |
| 7 | 56628 |
| 8 | 1169740 |
| 9 | 17454580 |
| 10 | 211083730 |
| 11 | 2198596400 |
| 12 | 20465052608 |
| 13 | 174437377400 |
| 14 | 1384928666550 |
| 15 | 10369994005800 |
| 16 | 73920866362200 |
| 17 | 505297829133240 |
| 18 | 3331309741059300 |
| 19 | 21280393666593600 |
| 20 | 132216351453357600 |
| 21 | 801482122777393200 |
| 22 | 4752780295205269470 |
| 23 | 27632111202537355800 |
[1485,56628,1169740,17454580,211083730,2198596400, 20465052608,174437377400,1384928666550, 10369994005800,73920866362200,505297829133240, 3331309741059300,21280393666593600, 132216351453357600,801482122777393200, 4752780295205269470,27632111202537355800] |