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A074616
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a(n) = 5^n + 7^n.
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9
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2, 12, 74, 468, 3026, 19932, 133274, 901668, 6155426, 42306732, 292240874, 2026154868, 14085427826, 98109713532, 684326588474, 4778079088068, 33385518460226, 233393453440332, 1632228295176074, 11417968671701268
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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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G.f.: 1/(1-5*x) + 1/(1-7*x).
E.g.f.: e^(5*x) + e^(7*x). (End)
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MATHEMATICA
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Table[5^n + 7^n, {n, 0, 20}]
LinearRecurrence[{12, -35}, {2, 12}, 20] (* Harvey P. Dale, Aug 26 2021 *)
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CROSSREFS
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Cf. A000051, A034472, A052539, A034474, A062394, A034491, A062395, A062396, A007689, A063376, A063481, A074600..A074624.
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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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