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Omni-MATH / How many functions f:{1,2,…,2013}→{1,2,…,2013} satisfy f(j)<f(i)+j−i for all integers i,j such that 1≤i<j≤2013 ?

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problem

How many functions f:{1,2,…,2013}→{1,2,…,2013}f:\{1,2, \ldots, 2013\} \rightarrow\{1,2, \ldots, 2013\} satisfy f(j)<f(i)+j−if(j)<f(i)+j-i for all integers i,ji, j such that 1≤i<j≤20131 \leq i<j \leq 2013 ?
Plain-text mathematical notation (without MathML)
How many functions f:{1,2,…,2013}→{1,2,…,2013} satisfy f(j)<f(i)+j−i for all integers i,j such that 1≤i<j≤2013 ?
Original LaTeX notation
How many functions $f:\{1,2, \ldots, 2013\} \rightarrow\{1,2, \ldots, 2013\}$ satisfy $f(j)<f(i)+j-i$ for all integers $i, j$ such that $1 \leq i<j \leq 2013$ ?

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