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| n | a(n) |
|---|---|
| 0 | 10 |
| 1 | 10 |
| 2 | 20 |
| 3 | 60 |
| 4 | 240 |
| 5 | 1200 |
| 6 | 8400 |
| 7 | 75600 |
| 8 | 831600 |
| 9 | 10810800 |
| 10 | 183783600 |
| 11 | 3491888400 |
| 12 | 73329656400 |
| 13 | 1686582097200 |
| 14 | 43851134527200 |
| 15 | 1227831766761600 |
| 16 | 36834953002848000 |
| 17 | 1289223355099680000 |
| 18 | 51568934203987200000 |
| 19 | 2372170973383411200000 |
| 20 | 123352890615937382400000 |
[10,10,20,60,240,1200,8400,75600,831600,10810800, 183783600,3491888400,73329656400,1686582097200, 43851134527200,1227831766761600,36834953002848000, 1289223355099680000,51568934203987200000, 2372170973383411200000,123352890615937382400000] |