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A077956
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Expansion of 1/(1-x+2*x^2+2*x^3).
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0
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1, 1, -1, -5, -5, 7, 27, 23, -45, -145, -101, 279, 771, 415, -1685, -4057, -1517, 9967, 21115, 4215, -57949, -108609, -1141, 331975, 551475, -110193, -1877093, -2759657, 1214915, 10488415, 13577899, -9828761, -57961389, -65459665, 70120635, 316962743, 307640803, -466525953
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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FORMULA
| a(0)=1, a(1)=1, a(2)=-1, a(n)=a(n-1)-2*a(n-2)-2*a(n-3) [From Harvey P. Dale, Oct 14 2011]
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MATHEMATICA
| CoefficientList[Series[1/(1-x+2x^2+2x^3), {x, 0, 40}], x] (* or *) LinearRecurrence[{1, -2, -2}, {1, 1, -1}, 40] (* From Harvey P. Dale, Oct 14 2011 *)
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CROSSREFS
| Sequence in context: A088048 A006146 * A077977 A019204 A114367 A093311
Adjacent sequences: A077953 A077954 A077955 * A077957 A077958 A077959
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KEYWORD
| sign
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002
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