id:A060422 - OEIS Search Results

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Number of acute triangles made from vertices of a regular n-gon.

+0
1

0, 0, 0, 1, 0, 5, 2, 14, 8, 30, 20, 55, 40, 91, 70, 140, 112, 204, 168, 285, 240, 385, 330, 506, 440, 650, 572, 819, 728, 1015, 910, 1240, 1120, 1496, 1360, 1785, 1632, 2109, 1938, 2470, 2280 (list; graph; listen)

	OFFSET	`0,6`
	FORMULA	`n(n+1)(n-1)/24 when n is odd; n(n-2)(n-4)/24 when n is even`
	CROSSREFS	`Union of A000330, A007290.` `Sequence in context: A085436 A158868 A104634 this_sequence A128142 A111267 A146343` `Adjacent sequences: A060419 A060420 A060421 this_sequence A060423 A060424 A060425`
	KEYWORD	`easy,nonn`
	AUTHOR	`Sen-Peng You (giawgwan(AT)single.url.com.tw), Apr 05 2001`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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