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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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listen;
history;
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internal format)
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OFFSET
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16,1
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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