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A016924
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a(n) = (6*n + 1)^4.
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9
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1, 2401, 28561, 130321, 390625, 923521, 1874161, 3418801, 5764801, 9150625, 13845841, 20151121, 28398241, 38950081, 52200625, 68574961, 88529281, 112550881, 141158161, 174900625, 214358881, 260144641, 312900721, 373301041, 442050625, 519885601, 607573201, 705911761
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listen;
history;
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internal format)
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OFFSET
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0,2
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LINKS
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FORMULA
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Sum_{n>=0} 1/a(n) = PolyGamma(3, 1/6)/7776. (End)
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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