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A037508
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Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,0.
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0
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1, 9, 63, 442, 3096, 21672, 151705, 1061937, 7433559, 52034914, 364244400, 2549710800, 17847975601, 124935829209, 874550804463, 6121855631242, 42852989418696, 299970925930872, 2099796481516105
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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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G.f.: x*(1+2*x) / ( (x-1)*(7*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 27 2015
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PROG
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(PARI) a(n)=([0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1; -7, 1, 0, 7]^(n-1)*[1; 9; 63; 442])[1, 1] \\ Charles R Greathouse IV, Feb 13 2017
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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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