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Search: id:A016273
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| A016273 |
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Expansion of 1/((1-2x)(1-3x)(1-5x)). |
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+0
1
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| 1, 10, 69, 410, 2261, 11970, 61909, 315850, 1598421, 8050130, 40425749, 202656090, 1014866581, 5079099490, 25409813589, 127092049130, 635589254741, 3178333432050, 15892828897429, 79467630222970
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n)=sum{0<=i,j,k,<=n, i+j+k=n, 2^i*3^j*5^k}. - Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Jun 25 2007
a(n)=(2^(n+3)+5^(n+2)-3^(n+3))/6. - Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Jun 25 2007
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MATHEMATICA
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CoefficientList[ Series[ 1/((1 - 2x)(1 - 3x)(1 - 5x)), {x, 0, 20} ], x ]
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CROSSREFS
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Adjacent sequences: A016270 A016271 A016272 this_sequence A016274 A016275 A016276
Sequence in context: A026988 A081280 A038806 this_sequence A128737 A130548 A090084
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KEYWORD
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nonn
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AUTHOR
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njas
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