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A234596
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Bicolored noncrossing configurations.
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0
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1, 8, 80, 992, 13760, 204416, 3180800, 51176960, 844467200, 14212646912, 243034542080, 4210466545664, 73745071063040, 1303643374125056, 23229596506849280, 416799595720736768, 7523942192296755200, 136549608206371389440, 2490043714311736524800, 45601540046865462984704
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OFFSET
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1,2
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LINKS
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FORMULA
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For a g.f. see F. Chapoton, S. Giraudo (2013), Prop. 2.9.
G.f.: 1/6*(1-4*t-sqrt(1-20*t+4*t^2)). - Paul Laubie, Nov 08 2023
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PROG
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(Sage) R.<t>=PowerSeriesRing(QQ); (1/6*(1-4*t-sqrt(1-20*t+4*t^2))).list()[1:]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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