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A074623
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a(n) = 7^n + 9^n.
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2
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2, 16, 130, 1072, 8962, 75856, 649090, 5606512, 48811522, 427774096, 3769259650, 33358386352, 296270823682, 2638754838736, 23555015527810, 210638693604592, 1886253119421442, 16909812213653776, 151723048894909570
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OFFSET
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0,1
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COMMENTS
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Up to signs, the ninth inverse binomial transform of 2^n+delta(n,0), where delta is the Kronecker delta function. - John M. Campbell, Jul 29 2018
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LINKS
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FORMULA
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G.f.: 1/(1-7*x) + 1/(1-9*x).
E.g.f.: exp^(7*x) + exp^(9*x). (End)
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MATHEMATICA
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Table[7^n + 9^n, {n, 0, 20}]
LinearRecurrence[{16, -63}, {2, 16}, 30] (* Harvey P. Dale, Aug 22 2015 *)
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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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