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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 12 |
| 3 | 84 |
| 4 | 2100 |
| 5 | 254100 |
| 6 | 183206100 |
| 7 | 923541950100 |
| 8 | 37238134969982100 |
| 9 | 13513011656042074430100 |
| 10 | 49036030210457135734021310100 |
| 11 | 1957361459740805606124917565020990100 |
| 12 | 937579272951542930363610919638075856505150100 |
[2,4,12,84,2100,254100,183206100,923541950100, 37238134969982100,13513011656042074430100, 49036030210457135734021310100, 1957361459740805606124917565020990100, 937579272951542930363610919638075856505150100] |