The Narayana numbers
count the number of paths through a square lattice from
that take only steps northeast and southeast, never pass below the
axis, and contain
peaks. The sum of the Narayana numbers
is equal to the Catalan number
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Stairstep Interpretation of Catalan Numbers
Catalan Number Trees
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Equivalence of Three Catalan Number Interpretations
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Stirling Numbers of the Second Kind
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Stirling Numbers of the Second Kind and Nonattacking Rooks
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