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A154882 as a simple table
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 12 |
| 4 | 120 |
| 5 | 7560 |
| 6 | 8648640 |
| 7 | 1927522396800 |
| 8 | 4747472432036420486400 |
| 9 | 128438082648984172330026178330296384000 |
| 10 | 6184173455628205993842062057864303743050691444602955105860128640000 |
[2,4,12,120,7560,8648640,1927522396800, 4747472432036420486400, 128438082648984172330026178330296384000, 61841734556282059938420620578643037430506914446029\ 55105860128640000] |