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A037733
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Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,0,3.
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1
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2, 15, 105, 738, 5168, 36177, 253239, 1772676, 12408734, 86861139, 608027973, 4256195814, 29793370700, 208553594901, 1459875164307, 10219126150152, 71533883051066, 500737181357463, 3505160269502241
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OFFSET
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1,1
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LINKS
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FORMULA
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a(n) = 7a(n-1) + a(n-4) - 7a(n-5).
G.f.: ( x*(2+x+3*x^3) ) / ( (x-1)*(7*x-1)*(1+x)*(1+x^2) ). - R. J. Mathar, Oct 14 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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