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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 30 |
| 3 | 204 |
| 4 | 1446 |
| 5 | 11550 |
| 6 | 108204 |
| 7 | 1091526 |
| 8 | 11998830 |
| 9 | 146864484 |
| 10 | 1920044166 |
| 11 | 26872081230 |
| 12 | 407766664284 |
| 13 | 6548790510726 |
| 14 | 111305007240510 |
| 15 | 2018907373622004 |
| 16 | 38462931870864486 |
| 17 | 769155464685741870 |
| 18 | 16240360254478668204 |
| 19 | 358012008058965575046 |
| 20 | 8233510983226617823230 |
| 21 | 198405453050668260272364 |
| 22 | 4967948949777295176374646 |
| 23 | 129158062469199137001844830 |
[6,30,204,1446,11550,108204,1091526,11998830, 146864484,1920044166,26872081230,407766664284, 6548790510726,111305007240510,2018907373622004, 38462931870864486,769155464685741870, 16240360254478668204,358012008058965575046, 8233510983226617823230,198405453050668260272364, 4967948949777295176374646, 129158062469199137001844830] |