A077556 - OEIS

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A077556

Meandric numbers for an undirected line crossing two perpendicular roads at n points, beginning in the (-,-) quadrant, crossing x axis first and ending in any quadrant.

0, 1, 2, 5, 12, 31, 81, 239 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Similar to A077551 but line is undirected.` `Sequence in context: A129804 A110035 A000635 * A097893 A093379 A076906` `Adjacent sequences: A077553 A077554 A077555 * A077557 A077558 A077559`
	KEYWORD	`nonn,more`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com) and Jon Wild (wild(AT)music.mcgill.ca), Aug 25 2003`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.