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A068532
a(n)=(5^(2^n)-1)/2^(n+2)/3.
+0
1
1, 13, 4069, 794728597, 60632980118195215861, 705860789378583615890268750566368301709493, 19132395032914835741678654577184988245746509713087362003723172302708614248937616\ 7456309
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Maintained by
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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.
AT&T Labs Research
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