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A307391
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a(n) is the number of canonical polygons with 4n edges containing only right angles.
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8
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2, 0, 2, 2, 8, 14, 62, 196, 892, 3788, 18098, 86302, 427340, 2136248
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OFFSET
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1,1
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COMMENTS
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It appears that for the same sequence of angles there is one solution with all straight edges and one with all diagonal edges, so all terms are even.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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