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A067686 as a simple table

n a(n)
0 8
1 15
2 127
3 15247
4 232364287
5 53993160246468367
6 2915261353400811631533974206368127
7 8498748758632331927648392184620600167779995785955324343380396911247

[8,15,127,15247,232364287,53993160246468367,
 2915261353400811631533974206368127,
 84987487586323319276483921846206001677799957859553\
 24343380396911247]

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Last modified July 21 02:02 EDT 2019. Contains 325189 sequences. (Running on oeis4.)