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

0,3

LINKS

Table of n, a(n) for n=0..7.

CROSSREFS

Similar to A077551 but line is undirected.

Sequence in context: A000635 A317098 A238427 * A076906 A097893 A093379

Adjacent sequences:  A077553 A077554 A077555 * A077557 A077558 A077559

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane and Jon Wild, Aug 25 2003

STATUS

approved

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Last modified August 13 04:54 EDT 2020. Contains 336442 sequences. (Running on oeis4.)