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Search: id:A006683
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| A006683 |
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Number of regions in certain maps.
(Formerly M0560)
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+0
1
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| 1, 2, 3, 4, 6, 8, 11, 15, 21, 28, 39, 53, 99, 137, 186
(list; graph; listen)
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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).
Gustavus J. Simmons, The ochromatic number of planar graphs, pp. 295-316 of F. Harary and J. S. Maybee, editors, Graphs and Applications. Wiley, NY, 1985.
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CROSSREFS
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Adjacent sequences: A006680 A006681 A006682 this_sequence A006684 A006685 A006686
Sequence in context: A087192 A046935 A095814 this_sequence A014213 A064323 A003411
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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