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A006683
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Number of regions in certain maps.
(Formerly M0560)
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0
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1, 2, 3, 4, 6, 8, 11, 15, 21, 28, 39, 53, 99, 137, 186
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| 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.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Sequence in context: A188917 A046935 A095814 * A014213 A064323 A003411
Adjacent sequences: A006680 A006681 A006682 * A006684 A006685 A006686
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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