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A057406
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Number of self-avoiding polygons of area n with one (self-avoiding polygon) hole on square lattice (not allowing rotations).
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3
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1, 12, 88, 524, 2786, 13788, 64998, 296032, 1314648, 5728172, 24595512, 104399172, 439084884, 1833027048, 7605691356, 31398503248, 129072844079, 528688519536, 2158900271080, 8792641674684, 35728408159781
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