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A153382
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a(n) = a(n-1) + 2*a(n-2) - a(n-3) - a(n-4), a(0)=0, a(1)=8, a(2)=10, a(3)=18.
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3
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0, 8, 10, 18, 30, 48, 80, 128, 210, 338, 550, 888, 1440, 2328, 3770, 6098, 9870, 15968, 25840, 41808, 67650, 109458, 177110, 286568, 463680, 750248, 1213930, 1964178, 3178110, 5142288, 8320400, 13462688, 21783090, 35245778, 57028870, 92274648
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: 2x(4+x-4x^2)/((1-x)(1+x)(1-x-x^2)).
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MATHEMATICA
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LinearRecurrence[{1, 2, -1, -1}, {0, 8, 10, 18}, 50] (* Paolo Xausa, Jan 19 2024 *)
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CROSSREFS
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KEYWORD
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nonn,easy,changed
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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