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A109220
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Expansion of (1+x-x^2)/(1-2x-2x^2+x^4).
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0
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1, 3, 7, 20, 53, 143, 385, 1036, 2789, 7507, 20207, 54392, 146409, 394095, 1060801, 2855400, 7685993, 20688691, 55688567, 149899116, 403489373, 1086088287, 2923466753, 7869210964, 21181866061, 57016065763, 153472396895
(list; graph; refs; listen; history; internal format)
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