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A165367
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Trisection a(n) = A026741(3n + 2).
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7
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1, 5, 4, 11, 7, 17, 10, 23, 13, 29, 16, 35, 19, 41, 22, 47, 25, 53, 28, 59, 31, 65, 34, 71, 37, 77, 40, 83, 43, 89, 46, 95, 49, 101, 52, 107, 55, 113, 58, 119, 61, 125, 64, 131, 67, 137, 70, 143, 73, 149, 76, 155, 79, 161, 82, 167, 85, 173, 88, 179, 91, 185, 94, 191, 97, 197
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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a(n) = 2*a(n-2) - a(n-4).
G.f.: (1 + 5*x + 2*x^2 + x^3)/((1-x)^2*(1+x)^2). (End)
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MAPLE
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A026741 := proc(n) if type(n, 'odd') then n; else n/2 ; fi; end:
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MATHEMATICA
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PROG
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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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All comments rewritten as formulas by R. J. Mathar, Nov 22 2009
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STATUS
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approved
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