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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 30 |
| 3 | 60 |
| 4 | 840 |
| 5 | 10080 |
| 6 | 110880 |
| 7 | 1441440 |
| 8 | 15135120 |
| 9 | 21162960 |
| 10 | 21162960 |
| 11 | 232792560 |
| 12 | 26771144400 |
| 13 | 26771144400 |
| 14 | 2730656728800 |
| 15 | 30278164316400 |
| 16 | 33977306563200 |
| 17 | 38000934972000 |
| 18 | 3610088822340000 |
| 19 | 37400520199442400 |
| 20 | 390033996365613600 |
| 21 | 438120379479182400 |
| 22 | 4505020423775071200 |
[1,30,60,840,10080,110880,1441440,15135120, 21162960,21162960,232792560,26771144400, 26771144400,2730656728800,30278164316400, 33977306563200,38000934972000,3610088822340000, 37400520199442400,390033996365613600, 438120379479182400,4505020423775071200] |