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Search: id:A059103
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| A059103 |
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Number of connected graphs on n points realizable in the plane with straight edges all of identical length; lines are permitted to cross. |
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+0
1
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OFFSET
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1,3
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COMMENT
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This counting problem is related to the well known problem to find the "chromatic number of the plane"
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EXAMPLE
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a(4)=5 because the complete graph on 4 points cannot be realized in the plane with all edges of equal length. All the other connected graphs with 4 points can be realized.
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CROSSREFS
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Sequence in context: A067021 A098716 A082938 this_sequence A112836 A105905 A075738
Adjacent sequences: A059100 A059101 A059102 this_sequence A059104 A059105 A059106
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KEYWORD
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hard,nonn
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AUTHOR
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David Newman (dznewman(AT)netvision.net.il), Feb 13 2001
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