Open Meanders
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An open meander of order is a non-self-intersecting curve (river) intersecting a line (road) at points (bridges).
Contributed by: David Bevan (March 2011)
Open content licensed under CC BY-NC-SA
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No formula, recurrence relation, or generating function is known yet for the number of distinct open meanders (the meandric numbers).
Permanent Citation
"Open Meanders"
http://demonstrations.wolfram.com/OpenMeanders/
Wolfram Demonstrations Project
Published: March 7 2011