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A077551 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. 2
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)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Similar to A076907 but must cross x axis first.

Sequence in context: A080056 A019096 A295358 * A106588 A123785 A121646

Adjacent sequences:  A077548 A077549 A077550 * A077552 A077553 A077554

KEYWORD

nonn,more

AUTHOR

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

EXTENSIONS

a(7) corrected by Robert Price, Jul 29 2012

a(8)-a(20) from Robert Price, Aug 14 2012

STATUS

approved

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Last modified October 6 02:32 EDT 2022. Contains 357261 sequences. (Running on oeis4.)