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A180236
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a(n) = a(n-2)+a(n-4); a(1)=a(4)=101, a(2)=a(3)=10.
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1
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101, 10, 10, 101, 111, 111, 121, 212, 232, 323, 353, 535, 585, 858, 938, 1393, 1523, 2251, 2461, 3644, 3984, 5895, 6445, 9539, 10429, 15434, 16874, 24973, 27303, 40407, 44177, 65380, 71480, 105787, 115657, 171167, 187137, 276954, 302794, 448121, 489931
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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G.f.: -x*(91*x^3-91*x^2+10*x+101) / (x^4+x^2-1). Colin Barker, Oct 03 2015
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MATHEMATICA
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LinearRecurrence[{0, 1, 0, 1}, {101, 10, 10, 101}, 50] (* Paolo Xausa, Jan 04 2024 *)
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PROG
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(PARI) Vec(-x*(91*x^3-91*x^2+10*x+101)/(x^4+x^2-1) + O(x^100)) \\ Colin Barker, Oct 03 2015
(PARI) a(n) = if(n==1||n==4, 101, if(n==2||n==3, 10, a(n-2)+a(n-4))); \\ Altug Alkan, Oct 03 2015
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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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