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A037494
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Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 2,1.
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0
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2, 19, 173, 1558, 14024, 126217, 1135955, 10223596, 92012366, 828111295, 7453001657, 67077014914, 603693134228, 5433238208053, 48899143872479, 440092294852312, 3960830653670810
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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) = 9*a(n-1) + a(n-2) - 9*a(n-3).
G.f.: x*(2+x)/((1-9*x)*(1-x^2)). a(n) = (19*9^n-4*(-1)^n-15)/80. - Bruno Berselli, Jan 20 2011
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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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