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A033123
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Base-5 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,1.
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1
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1, 5, 26, 131, 655, 3276, 16381, 81905, 409526, 2047631, 10238155, 51190776, 255953881, 1279769405, 6398847026, 31994235131, 159971175655, 799855878276, 3999279391381, 19996396956905, 99981984784526, 499909923922631, 2499549619613155, 12497748098065776
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = 5*a(n-1) + a(n-3) - 5*a(n-4).
G.f.: x*(1+x^2) / ((1-x)*(1-5*x)*(1+x+x^2)). - Colin Barker, Dec 24 2015
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MATHEMATICA
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Table[FromDigits[PadRight[{}, n, {1, 0, 1}], 5], {n, 30}] (* or *) LinearRecurrence[ {5, 0, 1, -5}, {1, 5, 26, 131}, 30] (* Harvey P. Dale, Mar 25 2019 *)
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PROG
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(PARI) Vec(x*(1+x^2)/((1-x)*(1-5*x)*(1+x+x^2)) + O(x^30)) \\ Colin Barker, Dec 24 2015
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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