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A074601
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a(n) = 2^n + 6^n.
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4
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2, 8, 40, 224, 1312, 7808, 46720, 280064, 1679872, 10078208, 60467200, 362799104, 2176786432, 13060702208, 78364180480, 470185017344, 2821109972992, 16926659575808, 101559956930560, 609359740534784, 3656158441111552
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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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a(n) = 6*a(n-1) - 2^n = 8*a(n-1) - 12*a(n-2).
G.f.: 1/(1-2*x) + 1/(1-6*x).
E.g.f.: e^(2*x) + e^(6*x). (End)
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MATHEMATICA
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Table[2^n + 6^n, {n, 0, 22}]
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PROG
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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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