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1, 3, 343, 11390625, 819628286980801, 977480813971145474830595007, 151313661355466579537756144585602921111718527, 24161564501550368558430041444810830996032029256261885166168212890625
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listen;
history;
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OFFSET
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1,2
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REFERENCES
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Bijan Davvaz, Polygroup theory and related systems, World Scientific Publishing Co. Plc. Ltd., New Jersey, (2013), p. 157 (for a(3) = 7^3 = 343).
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LINKS
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FORMULA
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a(n) = (2^n - 1)^(n*(n - 1)/2), n > 0.
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EXAMPLE
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For n = 3, a(3) = 7^3 = 343.
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MAPLE
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a:=n->(2^n-1)^(n*(n-1)/2): seq(a(n), n=1..8);
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MATHEMATICA
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a[n_] := (2^n-1)^(n*(n-1)/2); Array[a, 8] (* Stefano Spezia, Sep 02 2018 *)
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PROG
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(GAP) List([1..8], n->(2^n-1)^(n*(n-1)/2));
(Magma) SetDefaultRealField(RealField(100)); [Round((2^n-1)^(n*(n-1)/2)): n in [1..8]]; // G. C. Greubel, Oct 19 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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