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A077931
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Expansion of 1/((1-x)*(1+2*x+x^2+2*x^3)).
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1
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1, -1, 2, -4, 9, -17, 34, -68, 137, -273, 546, -1092, 2185, -4369, 8738, -17476, 34953, -69905, 139810, -279620, 559241, -1118481, 2236962, -4473924, 8947849, -17895697, 35791394, -71582788, 143165577, -286331153, 572662306, -1145324612, 2290649225, -4581298449, 9162596898
(list; graph; refs; listen; history; internal format)
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