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A007169
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Number of Q-graphs rooted at a polygon.
(Formerly M1865)
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1
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0, 1, 2, 8, 43, 283, 1946, 14010, 103292, 776784, 5931402, 45870248, 358501321, 2827227425, 22469524972, 179785568562, 1447059691048, 11708296894260, 95176461591230, 776935668014674, 6366225809581766, 52344041948585714
(list;
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listen;
history;
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internal format)
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OFFSET
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1,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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G.f. Sum_{r >= 2} Z(C_{2*r}; B(x)) where Z(C_{2*r}) is the cycle index of the cyclic group C_{2*r} and B(x) is the g.f. for A003168. - Sean A. Irvine, Nov 07 2017
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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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