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A081368 as a simple table
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 71 |
| 3 | 828 |
| 4 | 1828 |
| 5 | 45904 |
| 6 | 5235360 |
| 7 | 2874713 |
| 8 | 52662497 |
| 9 | 757247093 |
| 10 | 6999595749 |
| 11 | 66967627724 |
| 12 | 76630353547 |
| 13 | 5945713821785 |
| 14 | 25166427427466 |
| 15 | 391932003059921 |
| 16 | 8174135966290435 |
| 17 | 72900334295260595 |
| 18 | 630738132328627943 |
[2,71,828,1828,45904,5235360,2874713,52662497, 757247093,6999595749,66967627724,76630353547, 5945713821785,25166427427466,391932003059921, 8174135966290435,72900334295260595, 630738132328627943] |