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0, 0, 0, 1, 1, 3, 5, 9, 16, 27, 46, 77, 128, 212, 349, 573, 938, 1532, 2498, 4067, 6614, 10746, 17446, 28306, 45903, 74409, 120577, 195337, 316379, 512332, 829527, 1342940, 2173899, 3518736, 5695148, 9217213, 14916771, 24139826, 39064336
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,6
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LINKS
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FORMULA
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G.f.: x^4/((1-x-x^2)(1-x^2-x^3)). a(n)=a(n-1)+2*a(n-2)-2*a(n-4)-a(n-5). - R. J. Mathar, Oct 30 2008
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MATHEMATICA
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LinearRecurrence[{1, 2, 0, -2, -1}, {0, 0, 0, 1, 1}, 40] (* Harvey P. Dale, Jan 31 2024 *)
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PROG
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(PARI) a(n)=([0, 1, 0, 0, 0; 0, 0, 1, 0, 0; 0, 0, 0, 1, 0; 0, 0, 0, 0, 1; -1, -2, 0, 2, 1]^(n-1)*[0; 0; 0; 1; 1])[1, 1] \\ Charles R Greathouse IV, Oct 03 2016
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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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STATUS
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approved
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