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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 172 |
| 4 | 66 |
| 5 | 15952 |
| 6 | 84 |
| 7 | 22592 |
| 8 | 888 |
| 9 | 2196 |
| 10 | 3750 |
| 11 | 459932661 |
| 12 | 660 |
| 13 | 86817796083 |
| 14 | 185152 |
| 15 | 143366096 |
| 16 | 5304 |
| 17 | 17685013528576 |
| 18 | 3150 |
| 19 | 1786574475624429 |
| 20 | 1272510 |
| 21 | 29059703104 |
| 22 | 12872682 |
| 23 | 4817557477673402368 |
| 24 | 9576 |
| 25 | 85608255863 |
| 26 | 15744471040 |
| 27 | 1179648 |
| 28 | 124718750 |
| 29 | 1765038427619364800823267 |
[2,6,172,66,15952,84,22592,888,2196,3750, 459932661,660,86817796083,185152,143366096,5304, 17685013528576,3150,1786574475624429,1272510, 29059703104,12872682,4817557477673402368,9576, 85608255863,15744471040,1179648,124718750, 1765038427619364800823267] |