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A078006
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Expansion of (1-x)/(1-x-2*x^2-2*x^3).
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1
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1, 0, 2, 4, 8, 20, 44, 100, 228, 516, 1172, 2660, 6036, 13700, 31092, 70564, 160148, 363460, 824884, 1872100, 4248788, 9642756, 21884532, 49667620, 112722196, 255826500, 580606132, 1317703524, 2990568788, 6787188100, 15403732724, 34959246500, 79341088148, 180067046596
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| Harvey P. Dale, Table of n, a(n) for n = 0..999
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FORMULA
| a(0)=1, a(1)=0, a(2)=2, a(n)=a(n-1)+2*a(n-2)+2*a(n-3) [From Harvey P. Dale, Sep 25 2011]
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MATHEMATICA
| CoefficientList[Series[(1-x)/(1-x-2x^2-2x^3), {x, 0, 40}], x] (* or *) LinearRecurrence[{1, 2, 2}, {1, 0, 2}, 41] (* From Harvey P. Dale, Sep 25 2011 *)
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CROSSREFS
| Sequence in context: A026520 A105319 A051389 * A056952 A121703 A115219
Adjacent sequences: A078003 A078004 A078005 * A078007 A078008 A078009
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002
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