id:A055531 - OEIS Search Results

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Number of labeled order relations on n nodes in which longest chain has 2 nodes.

+0
2

2, 12, 86, 840, 11642, 227892, 6285806, 243593040, 13262556722, 1014466283292, 109128015915206, 16521353903210518, 3524056001906654788, 1059868947134489833998, 449831067019305306983532 (list; graph; listen)

	OFFSET	`2,1`
	REFERENCES	`L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 60.`
	FORMULA	`a(n)=A001831(n)-1.`
	CROSSREFS	`A column or diagonal of triangle in A008285. Cf. A052296.` `Sequence in context: A052887 A052867 A097237 this_sequence A059435 A143923 A079858` `Adjacent sequences: A055528 A055529 A055530 this_sequence A055532 A055533 A055534`
	KEYWORD	`easy,nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jul 10 2000`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Oct 24 2000`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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