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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 6 |
| 3 | 90 |
| 4 | 720 |
| 5 | 90 |
| 6 | 1680 |
| 7 | 45360 |
| 8 | 45360 |
| 9 | 1680 |
| 10 | 34650 |
| 11 | 2217600 |
| 12 | 7484400 |
| 13 | 2217600 |
| 14 | 34650 |
| 15 | 756756 |
| 16 | 94594500 |
| 17 | 756756000 |
| 18 | 756756000 |
| 19 | 94594500 |
| 20 | 756756 |
| 21 | 17153136 |
| 22 | 3705077376 |
| 23 | 57891834000 |
| 24 | 137225088000 |
| 25 | 57891834000 |
| 26 | 3705077376 |
| 27 | 17153136 |
[1,6,6,90,720,90,1680,45360,45360,1680,34650, 2217600,7484400,2217600,34650,756756,94594500, 756756000,756756000,94594500,756756,17153136, 3705077376,57891834000,137225088000,57891834000, 3705077376,17153136] |