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A077551
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Meandric numbers for a river (or directed line) crossing two perpendicular roads at n points, beginning in the (-,-) quadrant, crossing x axis first and ending in any quadrant.
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2
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0, 1, 3, 5, 16, 31, 105, 218, 770, 1673, 6096, 13672, 51027, 117194, 445787, 1042970, 4028922, 9567393, 37432324, 89984282, 355854272
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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CROSSREFS
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Similar to A076907 but must cross x axis first.
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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