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A273161
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a(n) = Sum_{k=1..n} C(n-k, floor((n-k)/k)).
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3
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0, 1, 2, 3, 5, 7, 13, 19, 34, 61, 108, 174, 384, 641, 1166, 2337, 4458, 7828, 16421, 29346, 57231, 114126, 215915, 396491, 839324, 1549146, 2983185, 5978656, 11628952, 21812113, 45099914, 84842925, 166417181, 332267593, 647614074, 1234586894, 2538571022
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OFFSET
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0,3
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LINKS
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FORMULA
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MAPLE
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A273161:=n->add(binomial(n-i, floor((n-i)/i)), i=1..n): seq(A273161(n), n=0..50);
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MATHEMATICA
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Table[Sum[Binomial[n - i, Floor[(n - i)/i]], {i, n}], {n, 0, 40}]
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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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