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Search: id:A140106
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| A140106 |
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Number of noncongruent diagonals in a regular n-gon. |
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+0
1
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| 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10
(list; graph; listen)
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OFFSET
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1,6
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EXAMPLE
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The square (n=4) has two congruent diagonals; so a(4)=1. The regular pentagon also has congruent diagonals; so a(5)=1. Among all the diagonals in a regular hexagon, there are two noncongruent ones; hence a(6)=2, etc.
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CROSSREFS
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Sequence in context: A088461 A135020 A072921 this_sequence A034888 A086388 A080513
Adjacent sequences: A140103 A140104 A140105 this_sequence A140107 A140108 A140109
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KEYWORD
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nonn
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AUTHOR
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Andrew McFarland (andrewmcfarland1(AT)hotmail.com), Jun 03 2008
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