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A289453
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Related to number of mesh patterns of length 2 that avoid the pattern 321.
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0
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1, 1, 1, 2, 5, 13, 36, 103, 303, 910, 2779
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,4
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LINKS
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FORMULA
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Conjectured g.f.: (2-sqrt(2))*x/2+x/sqrt(2)*C(sqrt(2)*x/(x^2+(2*sqrt(2)-1)*x+1)), where C(x) is the g.f. for the Catalan numbers, A000108. - Michael D. Weiner, Jul 20 2022
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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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