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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 42 |
| 3 | 930 |
| 4 | 16002 |
| 5 | 67084290 |
| 6 | 17179475970 |
| 7 | 274876334082 |
| 8 | 4611686011984936962 |
| 9 | 5316911983139663484697699213480296450 |
| 10 | 383123885216472214589586754930667236976614368197214210 |
[6,42,930,16002,67084290,17179475970,274876334082, 4611686011984936962, 5316911983139663484697699213480296450, 38312388521647221458958675493066723697661436819721\ 4210] |