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A155588
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a(n) = 5^n + 2^n - 1^n.
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30
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1, 6, 28, 132, 640, 3156, 15688, 78252, 390880, 1953636, 9766648, 48830172, 244144720, 1220711316, 6103532008, 30517610892, 152587956160, 762939584196, 3814697527768, 19073486852412, 95367432689200, 476837160300276
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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.: 1/(1-5*x)+1/(1-2*x)-1/(1-x).
E.g.f.: e^(5*x)+e^(2*x)-e^x.
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MATHEMATICA
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CoefficientList[Series[1/(1 - 5 x) + 1/(1 - 2 x) - 1/(1 - x), {x, 0, 21}], x] (* Michael De Vlieger, Mar 02 2022 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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