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A265821
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Expansion of Product_{k>=1} 1/(1 - (3*k-2)*x^(3*k-2)).
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9
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1, 1, 1, 1, 5, 5, 5, 12, 28, 28, 38, 66, 130, 143, 232, 344, 616, 738, 1094, 1561, 2840, 3671, 5117, 7227, 12833, 16182, 22428, 32205, 57058, 71006, 98684, 141253, 241563, 301889, 421994, 610113, 1018507, 1278706, 1784671, 2549610, 4224964, 5333003, 7491698
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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) ~ c * 2^(n/2), where
c = 4.633065657780064798394952757560310709647495826095820632429... if mod(n,4) = 0
c = 4.169885941972377533366541853673119715620037601993736640548... if mod(n,4) = 1
c = 4.088913297791237602600754017373520586356446410096065167531... if mod(n,4) = 2
c = 4.069986547973463713613958049535085419215417774875202440925... if mod(n,4) = 3.
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MATHEMATICA
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nmax = 40; CoefficientList[Series[Product[1/(1 - (3*k-2)*x^(3*k-2)), {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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