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A057819
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a(0)=4, a(1)=9, a(n) = 4a(n-1) - a(n-2).
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0
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4, 9, 32, 119, 444, 1657, 6184, 23079, 86132, 321449, 1199664, 4477207, 16709164, 62359449, 232728632, 868555079, 3241491684, 12097411657, 45148154944, 168495208119, 628832677532, 2346835502009, 8758509330504, 32687201820007
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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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MATHEMATICA
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Transpose[NestList[{Last[#], 4Last[#]-First[#]}&, {4, 9}, 40]][[1]] (* Harvey P. Dale, Mar 09 2011 *)
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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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