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A173506
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a(n) = (3^(3^n) - 1)/2.
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1
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OFFSET
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0,2
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LINKS
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FORMULA
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2*a(n+1) + 1 = ( 2*a(n) + 1 )^3.
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MATHEMATICA
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Table[(3^(3^m) -1)/2, {m, 0, 10}]
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PROG
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(Sage) [(3^(3^n) -1)/2 for n in (0..10)] # G. C. Greubel, Apr 25 2021
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Introduced standard nomenclature in the definition, added recurrence - the Assoc. Editors of the OEIS, Feb 24 2010
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STATUS
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approved
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