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A280909
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Expansion of Product_{k>=1} ((1-x^(12*k)) * (1-x^(12*k-10)) * (1-x^(12*k-9)) / (1-x^k)).
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1
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1, 1, 1, 1, 2, 3, 4, 5, 7, 9, 12, 15, 19, 24, 30, 37, 47, 58, 72, 87, 107, 130, 158, 190, 229, 275, 330, 393, 469, 557, 661, 780, 921, 1084, 1275, 1494, 1750, 2044, 2386, 2777, 3231, 3750, 4348, 5030, 5815, 6711, 7738, 8905, 10240, 11757, 13488, 15449, 17680
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OFFSET
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0,5
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LINKS
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FORMULA
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a(n) ~ 3^(1/12) * Pi^(19/12) * exp(Pi*sqrt(n/2)) / (Gamma(1/4) * Gamma(1/6) * 2^(35/24) * n^(25/24)).
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MATHEMATICA
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nmax = 60; CoefficientList[Series[Product[(1-x^(12*k)) * (1-x^(12*k-10)) * (1-x^(12*k-9)) / (1-x^k), {k, 1, nmax}], {x, 0, nmax}], x]
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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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