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A103933
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Denominators of first difference of squares of harmonic numbers A001008/A002805.
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2
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1, 4, 9, 48, 150, 90, 490, 2240, 11340, 2520, 152460, 83160, 2342340, 2522520, 540540, 11531520, 104144040, 110270160, 737176440, 775975200, 162954792, 56904848, 1368302936, 2141691552, 111546435000, 116008292400, 1084231348200
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OFFSET
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1,2
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COMMENTS
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The corresponding numerators are given in A103932. For the rationals see the link there.
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LINKS
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FORMULA
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a(n)=numerator(r(n)), with the rationals r(n)=H(n)^2-H(n-1)^2 where H(n)= A001008(n)/A002805(n), n>=1, H(0):=0.
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MATHEMATICA
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Denominator[Differences[HarmonicNumber[Range[0, 30]]^2]] (* Harvey P. Dale, Sep 09 2012 *)
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CROSSREFS
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KEYWORD
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nonn,easy,frac
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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