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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 120 |
| 4 | 30 |
| 5 | 30240 |
| 6 | 5040 |
| 7 | 17297280 |
| 8 | 2162160 |
| 9 | 240240 |
| 10 | 360360 |
| 11 | 28158588057600 |
| 12 | 2346549004800 |
| 13 | 64764752532480000 |
| 14 | 4626053752320000 |
| 15 | 308403583488000 |
| 16 | 19275223968000 |
| 17 | 830034394580628357120000 |
| 18 | 46113021921146019840000 |
[1,12,120,30,30240,5040,17297280,2162160,240240, 360360,28158588057600,2346549004800, 64764752532480000,4626053752320000, 308403583488000,19275223968000, 830034394580628357120000,46113021921146019840000] |