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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 October 21 03:03 EDT 2024. Contains 376963 sequences.
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