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A056639
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Number of polygons of length 2n with 3 (self-avoiding polygon) holes on square lattice (not allowing rotations).
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2
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62, 3920, 130560, 3058544, 56925214, 900355884, 12619939046, 161208191596, 1913821820768, 21416926011756, 228320059956022, 2337581305737496, 23128907576991302, 222266054948571020, 2082868947950189248
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