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A168321
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a(n) = n +6 - a(n-1), with a(1) = 0.
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1
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0, 8, 1, 9, 2, 10, 3, 11, 4, 12, 5, 13, 6, 14, 7, 15, 8, 16, 9, 17, 10, 18, 11, 19, 12, 20, 13, 21, 14, 22, 15, 23, 16, 24, 17, 25, 18, 26, 19, 27, 20, 28, 21, 29, 22, 30, 23, 31, 24, 32, 25, 33, 26, 34, 27, 35, 28, 36, 29, 37, 30, 38, 31, 39, 32, 40, 33, 41, 34, 42, 35, 43, 36
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = a(n-1) + a(n-2) - a(n-3).
a(n) = (13 + 15*(-1)^n + 2*n)/4.
G.f.: x^2*(8 - 7*x)/((1+x)*(1-x)^2). (End)
E.g.f.: (1/4)*(15 - 28*exp(x) + (13 + 2*x)*exp(2*x))*exp(-x). - G. C. Greubel, Jul 17 2016
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MATHEMATICA
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a=7; Table[a=n-a, {n, a, 200}]
LinearRecurrence[{1, 1, -1}, {0, 8, 1}, 50] (* G. C. Greubel, Jul 17 2016 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,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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