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A168300
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a(n) = 6*n - a(n-1) - 2 with a(1)=5.
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3
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5, 5, 11, 11, 17, 17, 23, 23, 29, 29, 35, 35, 41, 41, 47, 47, 53, 53, 59, 59, 65, 65, 71, 71, 77, 77, 83, 83, 89, 89, 95, 95, 101, 101, 107, 107, 113, 113, 119, 119, 125, 125, 131, 131, 137, 137, 143, 143, 149, 149, 155, 155, 161, 161, 167, 167, 173, 173, 179, 179
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OFFSET
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1,1
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LINKS
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FORMULA
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G.f.: x*(5 + x^2)/((1+x)*(1-x)^2). (End)
E.g.f.: (1/2)*(-3 + 2*exp(x) + (1 + 6*x)*exp(2*x))*exp(-x). - G. C. Greubel, Jul 17 2016
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MATHEMATICA
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LinearRecurrence[{1, 1, -1}, {5, 5, 11}, 50] (* G. C. Greubel, Jul 17 2016 *)
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PROG
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(Magma) [n le 2 select 5 else 6*n-Self(n-1)-2: n in [1..60]]; // Bruno Berselli, Apr 14 2011
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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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EXTENSIONS
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STATUS
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approved
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