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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 12 |
| 5 | 12 |
| 6 | 360 |
| 7 | 60 |
| 8 | 1680 |
| 9 | 2520 |
| 10 | 25200 |
| 11 | 2520 |
| 12 | 332640 |
| 13 | 27720 |
| 14 | 5045040 |
| 15 | 5405400 |
| 16 | 2882880 |
| 17 | 720720 |
| 18 | 220540320 |
| 19 | 12252240 |
| 20 | 4655851200 |
| 21 | 4888643760 |
| 22 | 5121436320 |
| 23 | 232792560 |
| 24 | 128501493120 |
| 25 | 26771144400 |
| 26 | 696049754400 |
[1,1,2,12,12,360,60,1680,2520,25200,2520,332640, 27720,5045040,5405400,2882880,720720,220540320, 12252240,4655851200,4888643760,5121436320, 232792560,128501493120,26771144400,696049754400] |