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A147786
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Number of partitions of n into parts divisible by 4 or 5.
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5
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1, 0, 0, 0, 1, 1, 0, 0, 2, 1, 2, 0, 3, 2, 2, 3, 5, 3, 4, 3, 11, 5, 6, 6, 15, 13, 10, 9, 23, 17, 23, 15, 34, 27, 31, 33, 50, 40, 48, 45, 86, 60, 71, 69, 116, 106, 105, 102, 169, 144, 176, 150, 237, 211, 240, 248, 335, 299, 347, 338, 506, 425, 487, 487, 681
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OFFSET
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0,9
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COMMENTS
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Also number of partitions of n with no part and no difference between two parts equal to 1,2,3,6,7 or 11.
Also number of partitions of n with no part appearing 1,2,3,6,7 or 11 times.
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LINKS
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FORMULA
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G.f.: Product_{k>=1} (1-x^(20k))/(1-x^(4k))/(1-x^(5k)).
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MATHEMATICA
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nmax = 60; CoefficientList[Series[Product[(1 + x^(5*k))*(1 + x^(10*k))/(1 - x^(4*k)), {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Sep 23 2015 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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Alexander E. Holroyd (holroyd at math.ubc.ca)
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STATUS
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approved
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