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A168336
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a(n) = 5 + 7*floor((n-1)/2).
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2
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5, 5, 12, 12, 19, 19, 26, 26, 33, 33, 40, 40, 47, 47, 54, 54, 61, 61, 68, 68, 75, 75, 82, 82, 89, 89, 96, 96, 103, 103, 110, 110, 117, 117, 124, 124, 131, 131, 138, 138, 145, 145, 152, 152, 159, 159, 166, 166, 173, 173, 180, 180, 187, 187, 194, 194, 201, 201, 208
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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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a(n) = 7*n - a(n-1) - 4, with n>1, a(1)=5.
E.g.f.: (1/2)*(4 + (7*x - 4)*cosh(x) + (7*x + 3)* sinh(x)). - G. C. Greubel, Jul 18 2016
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MATHEMATICA
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Table[5 + 7 Floor[(n - 1)/2], {n, 60}] (* Bruno Berselli, Sep 18 2013 *)
CoefficientList[Series[(5 + 2 x^2)/((1 + x) (x - 1)^2), {x, 0, 70}], x] (* Vincenzo Librandi, Sep 18 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy,less
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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