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A078504
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a(n) = binomial(sigma(n+1), sigma(n)).
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0
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3, 4, 35, 0, 924, 0, 6435, 0, 8568, 0, 30421755, 0, 1961256, 1, 2629575, 0, 62359143990, 0, 513791607420, 0, 58905, 0, 36052387482172425, 0, 4280561376, 0, 41648951840265, 0, 164307576757973059488, 0, 916312070471295267, 0, 25827165
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Table[Binomial[DivisorSigma[1, i + 1], DivisorSigma[1, i]], {i, 1, 50}]
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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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