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A091927
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Expansion of (1-6x)/(1-6x-5x^2).
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1
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1, 0, 5, 30, 205, 1380, 9305, 62730, 422905, 2851080, 19221005, 129581430, 873593605, 5889468780, 39704780705, 267676028130, 1804580072305, 12165860574480, 82018063808405, 552937685722830, 3727716433379005
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OFFSET
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0,3
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COMMENTS
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Let the generating matrix of the Golay G_12 code be [I|B]. Then a(n)=(B^n)_1,1.
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LINKS
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FORMULA
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a(n)=5(sqrt(14)(3+sqrt(14))^(n-1)/28-sqrt(14)(3-sqrt(14))^(n-1)/28)
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MATHEMATICA
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CoefficientList[Series[(1-6x)/(1-6x-5x^2), {x, 0, 30}], x] (* or *) LinearRecurrence[ {6, 5}, {1, 0}, 30](* Harvey P. Dale, Aug 11 2019 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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