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A268950
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Number of perfectly looping walks containing n pieces from the set described in the links.
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0
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0, 0, 0, 2, 1, 5, 7, 33, 74, 304, 986
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,4
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COMMENTS
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These perfectly looping walks are similar, but still different from self-avoiding polygons on the square lattice (A002931) and allow one to realize toy tracks.
Rotations, reflections and translations are allowed.
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LINKS
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EXAMPLE
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Some examples are given in the linked paper arxiv.org:1603.08775:
* the a(7)=7 tracks are plotted in Figure 14, p. 24
* some of a(8)=33 tracks are plotted in Figure 15, p. 25
* some of a(9)=74 tracks are plotted in Figure 16, p. 26
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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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