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A123877
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Expansion of (1+2x)/(1+3x+3x^2).
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2
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1, -1, 0, 3, -9, 18, -27, 27, 0, -81, 243, -486, 729, -729, 0, 2187, -6561, 13122, -19683, 19683, 0, -59049, 177147, -354294, 531441, -531441, 0, 1594323, -4782969, 9565938, -14348907, 14348907, 0, -43046721
(list; graph; refs; listen; history; internal format)
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