A076906 - OEIS

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A076906

Meandric numbers for a river (or directed line) crossing two perpendicular roads at n points, beginning in the (-,-) quadrant and ending in the (+,+) quadrant if n even, in the (+,-) quadrant if n odd.

0, 1, 2, 5, 12, 31, 82, 239 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Cf. A005316, A076875 (undirected line), A076876, A076907 (end anywhere).` `Sequence in context: A077556 A097893 A093379 * A071359 A160999 A014329` `Adjacent sequences: A076903 A076904 A076905 * A076907 A076908 A076909`
	KEYWORD	`nonn,more,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com) and Jon Wild (wild(AT)music.mcgill.ca), Nov 26, 2002`
	EXTENSIONS	`a(7) corrected Aug 25 2003`

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Last modified February 15 05:45 EST 2012. Contains 205694 sequences.