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A173773
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a(3*n) = 8*n+2, a(3*n+1) = 2*n+1, a(3*n+2) = 8*n+6.
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1
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2, 1, 6, 10, 3, 14, 18, 5, 22, 26, 7, 30, 34, 9, 38, 42, 11, 46, 50, 13, 54, 58, 15, 62, 66, 17, 70, 74, 19, 78, 82, 21, 86, 90, 23, 94, 98, 25, 102, 106, 27, 110, 114, 29, 118, 122, 31, 126, 130, 33, 134, 138, 35, 142, 146, 37, 150, 154, 39, 158, 162, 41, 166
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OFFSET
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0,1
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LINKS
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FORMULA
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G.f.: (1+x)*(2-x+7*x^2-x^3+2*x^4)/(1-x^3)^2.
Sum_{n>=0} (-1)^(n+1)/a(n) = (2-sqrt(2))*Pi/8. - Amiram Eldar, Oct 08 2023
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MATHEMATICA
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Table[Sequence @@ {8*n+2, 2*n+1, 8*n+6}, {n, 0, 20}] (* Amiram Eldar, Oct 08 2023 *)
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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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STATUS
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approved
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