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A003478
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Expansion of 1/((1-2*x)*(1-x-2*x^3)).
(Formerly M2662)
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1
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1, 3, 7, 17, 39, 85, 183, 389, 815, 1693, 3495, 7173, 14655, 29837, 60567, 122645, 247855, 500061, 1007495, 2027493, 4076191, 8188333, 16437623, 32978613, 66132495, 132562173, 265628263, 532110981, 1065670783, 2133798221, 4271762007, 8550587221, 17113150959
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OFFSET
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0,2
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REFERENCES
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D. E. Daykin and S. J. Tucker, Introduction to Dragon Curves. Unpublished, 1976. See links in A003229 for an earlier version.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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G.f.: 1/((1-2*x)*(1-x-2*x^3)).
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MAPLE
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MATHEMATICA
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CoefficientList[Series[1/((1-2x)(1-x-2x^3)), {x, 0, 50}], x] (* Harvey P. Dale, Mar 14 2011 *)
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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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EXTENSIONS
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STATUS
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approved
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