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A230059
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Conjectural number of irreducible zeta values of weight 2*n+1 and depth three.
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3
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0, 0, 0, 0, 1, 2, 2, 4, 5, 6, 8, 10, 11, 14, 16, 18, 21, 24, 26, 30, 33, 36, 40, 44, 47, 52, 56, 60, 65
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OFFSET
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1,6
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COMMENTS
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a(n) corresponds to the value predicted by the Broadhurst-Kreimer conjecture.
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LINKS
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FORMULA
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Conjecturally, a(n) = [((n-1)^2-1)/12] for n > 1.
Conjecturally, g.f.: x^5*(1+x-x^2)/((1-x)*(1-x^2)*(1-x^3)).
Conjecturally, a(n) = if(n<5, 0, (1/2)*(-2*a(n-3) - 4*a(n-2) - 4*a(n-1) + n^2 - 5*n + 2)). - Jean-François Alcover, Feb 23 2019.
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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