id:A051493 - OEIS Search Results

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Triangles with integer-length sides and perimeter n, not isomorphic to any triangle with integer-length sides and perimeter<n.

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13

0, 0, 1, 0, 1, 0, 2, 1, 2, 1, 4, 2, 5, 2, 5, 4, 8, 4, 10, 6, 9, 6, 14, 8, 15, 9, 16, 12, 21, 11, 24, 16, 22, 16, 27, 18, 33, 20, 31, 24, 40, 23, 44, 30, 39, 30, 52, 32, 54, 35, 52, 42, 65, 38, 65, 48, 64, 49, 80, 48, 85, 56, 77, 64, 90, 58, 102, 72, 93, 69, 114, 72, 120, 81 (list; graph; listen)

	OFFSET	`1,7`
	LINKS	`N. J. A. Sloane, Transforms`
	FORMULA	`Moebius transform of A005044(n-3).`
	EXAMPLE	`There are 3 triangles with integer-length sides and perimeter 9: 1-4-4, 2-3-4, 3-3-3. 3-3-3 is omitted because isomorphic to 1-1-1, so a(9)=2.`
	CROSSREFS	`Sequence in context: A161270 A160974 A029196 this_sequence A029173 A002331 A060805` `Adjacent sequences: A051490 A051491 A051492 this_sequence A051494 A051495 A051496`
	KEYWORD	`nonn`
	AUTHOR	`N. Fernandez (primeness(AT)borve.org)`
	EXTENSIONS	`Corrected and extended with formula by Christian G. Bower (bowerc(AT)usa.net), Nov 15 1999.`

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Last modified March 20 09:10 EDT 2010. Contains 173642 sequences.

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