id:A140106 - OEIS Search Results

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Number of noncongruent diagonals in a regular n-gon.

+0
1

0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31, 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37 (list; graph; listen)

	OFFSET	`1,6`
	EXAMPLE	`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.`
	CROSSREFS	`Essentially the same as A004526. [From Joseph Myers (jsm(AT)polyomino.org.uk), Sep 05 2009]` `Sequence in context: A001057 A130472 A004526 this_sequence A123108 A008619 A110654` `Adjacent sequences: A140103 A140104 A140105 this_sequence A140107 A140108 A140109`
	KEYWORD	`nonn`
	AUTHOR	`Andrew McFarland (andrewmcfarland1(AT)hotmail.com), Jun 03 2008`
	EXTENSIONS	`More terms from Joseph Myers (jsm(AT)polyomino.org.uk), Sep 05 2009`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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