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A076906
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Meandric numbers for a river (or directed line) crossing two perpendicular roads at n points, beginning in the (-,-) quadrant and ending in the (+,+) quadrant if n even, in the (+,-) quadrant if n odd.
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23
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0, 1, 2, 5, 12, 31, 82, 218, 612, 1673, 4892, 13672, 41192, 117194, 361302, 1042970, 3274712, 9567393, 30490688, 89984282, 290353456
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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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KEYWORD
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nonn,more,nice
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AUTHOR
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EXTENSIONS
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a(7) corrected Aug 25 2003
a(7) corrected and a(8)-a(20) added by Robert Price, Jul 29 2012
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STATUS
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approved
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