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A028061
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Expansion of 1/((1-3x)(1-5x)(1-7x)(1-10x)).
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0
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1, 25, 404, 5390, 64791, 731595, 7939714, 83955520, 872430581, 8959286765, 91262059824, 924426748050, 9327520083571, 93861018423535, 942726158964734, 9456149685174980, 94764094925599761, 949061042927869905, 9500560621143838444, 95075305236466788310, 951241183953215635151
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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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a(n) = (8*10^(n+3)-5*7^(n+4)+42*5^(n+3)-5*3^(n+4))/840. [Yahia Kahloune, Jun 08 2013]
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MATHEMATICA
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CoefficientList[Series[1/((1-3x)(1-5x)(1-7x)(1-10x)), {x, 0, 20}], x] (* Harvey P. Dale, Jan 29 2020 *)
Table[(8 10^(n + 3) - 5 7^(n + 4) + 42 5^(n + 3) - 5 3^(n + 4)) / 840, {n, 0, 40}] (* Vincenzo Librandi, Jan 30 2020 *)
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PROG
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(Magma) m:=30; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!( 1/((1-3*x)*(1-5*x)*(1-7*x)*(1-10*x)))); // Vincenzo Librandi, Jan 30 2020
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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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