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A145622
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Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=7.
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1
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2, 12, 20, 40, 72, 792, 10296, 102960, 583440, 11085360, 3695120, 254963280, 1274816400, 11473347600, 332727080400, 20629078984800, 20629078984800, 20629078984800, 763275922437600, 763275922437600, 31294312819941600
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OFFSET
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1,1
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COMMENTS
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For numerators see A145621. For general properties of A_l(x) see A145609.
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LINKS
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Table of n, a(n) for n=1..21.
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MATHEMATICA
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m = 7; aa = {}; Do[k = 0; Do[k = k + m^(2 r + 1 - d)/d, {d, 1, 2 r}]; AppendTo[aa, Denominator[k]], {r, 1, 30}]; aa (*Artur Jasinski*)
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CROSSREFS
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Cf. A145609 - A145640.
Sequence in context: A326238 A226399 A121859 * A266050 A291698 A174478
Adjacent sequences: A145619 A145620 A145621 * A145623 A145624 A145625
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KEYWORD
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frac,nonn
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AUTHOR
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Artur Jasinski, Oct 14 2008
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EXTENSIONS
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Edited by R. J. Mathar, Aug 21 2009
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STATUS
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approved
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