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A006389
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Number of unsensed planar maps with n edges and without faces of degree 1.
(Formerly M1632)
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0
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1, 2, 6, 18, 68, 313, 1592, 9187, 57451, 384450, 2703970, 19769311
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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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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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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