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| n | a(n) |
|---|---|
| 1 | 60 |
| 2 | 23940 |
| 3 | 9528120 |
| 4 | 3792167880 |
| 5 | 1509273288180 |
| 6 | 600686976527820 |
| 7 | 239071907384784240 |
| 8 | 95150018452167599760 |
| 9 | 37869468272055319920300 |
| 10 | 15071953222259565160679700 |
| 11 | 5998599512991034878630600360 |
| 12 | 2387427534217209622129818263640 |
| 13 | 950190160018936438572789038328420 |
[60,23940,9528120,3792167880,1509273288180, 600686976527820,239071907384784240, 95150018452167599760,37869468272055319920300, 15071953222259565160679700, 5998599512991034878630600360, 2387427534217209622129818263640, 950190160018936438572789038328420] |