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Search: id:A077556
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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
0, 1, 2, 5, 12, 31, 81, 239 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Similar to A077551 but line is undirected.

Adjacent sequences: A077553 A077554 A077555 this_sequence A077557 A077558 A077559

Sequence in context: A129804 A110035 A000635 this_sequence A097893 A093379 A076906

KEYWORD

nonn,more

AUTHOR

njas and Jon Wild (wild(AT)music.mcgill.ca), Aug 25 2003

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Last modified October 15 09:18 EDT 2008. Contains 145015 sequences.

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