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1, 5, 22, 89, 340, 1247, 4438, 15437, 52744, 177659, 591514, 1950665, 6381388, 20734391, 66977950, 215266373, 688813072, 2195513843, 6973830946, 22083492161, 69736736596, 219669514415, 690387505702, 2165301501629
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listen;
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internal format)
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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G.f.: (1-3x+3x^2)/((1-2x)(1-3x)^2)
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MATHEMATICA
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Table[2^n+n*3^n, {n, 0, 30}] (* or *) LinearRecurrence[{8, -21, 18}, {1, 5, 22}, 30] (* Harvey P. Dale, Jun 06 2017 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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