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A038393
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Number of 4n-step self-avoiding closed paths on first quadrant grid, passing through origin, symmetric about line y = x.
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0
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1, 1, 2, 6, 20, 78, 342, 1608, 7966, 41054, 218342, 1191038, 6635164, 37621952, 216557220, 1262829914, 7447921572
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