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2, -1, -8, 15, 22, -104, 17, 510, -721, -1708, 5806, 1503, -31520, 31519, 121778, -312396, -233455, 1885694, -1152593, -8196936, 16079050, 21867343, -109306936, 24246207, 528076766, -780482080, -1726348607, 6132589566, 1190594623, -32799408980, 34705374038, 124349675919, -331866549712
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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COMMENTS
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LINKS
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FORMULA
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G.f.: ( 2+x+x^2 ) / ( 1+x+5*x^2-x^3+x^4 ). - R. J. Mathar, Jun 18 2014
a(n) = -a(n-1) - 5*a(n-2) + a(n-3) - a(n-4) for n>3. - Colin Barker, Dec 27 2017
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MATHEMATICA
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LinearRecurrence[{-1, -5, 1, -1}, {2, -1, -8, 15}, 40] (* Harvey P. Dale, Aug 01 2021 *)
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PROG
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(PARI) Vec((2 + x + x^2) / (1 + x + 5*x^2 - x^3 + x^4) + O(x^40)) \\ Colin Barker, Dec 27 2017
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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