Narayana Numbers

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The Narayana numbers count the number of paths through a square lattice from
to
that take only steps northeast and southeast, never pass below the
axis, and contain
peaks. The sum of the Narayana numbers
over
is equal to the Catalan number
.
Contributed by: Robert Dickau (March 2011)
Open content licensed under CC BY-NC-SA
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"Narayana Numbers"
http://demonstrations.wolfram.com/NarayanaNumbers/
Wolfram Demonstrations Project
Published: March 7 2011