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A294724
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Number of Q graphs with 2*n vertices rooted at an internal edge.
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1
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0, 0, 0, 1, 11, 96, 785, 6283, 49987, 397768, 3174084, 25426290, 204538114, 1652327820, 13402442651, 109129475455, 891793354235, 7312118010384, 60141701374424, 496095022537998, 4103183675407098, 34022136992384720
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listen;
history;
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OFFSET
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1,5
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LINKS
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FORMULA
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G.f.: P(x) * (B(x) - x)^2 where P(x) is the g.f. for A003169 and B(x) is the g.f. for A003168.
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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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