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A121769
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Number of neighbor-avoiding polygons of perimeter 2n on square lattice.
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1
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0, 1, 0, 1, 2, 9, 36, 154, 668, 2932, 13016, 58364, 264208, 1206818, 5558724, 25803509, 120638466, 567732133, 2687937916, 12796823923, 61235363802, 294407424869, 1421635103832, 6892590800146, 33543439104796
(list; graph; refs; listen; history; internal format)
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