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The mean and variance of the number of appearances of a given subgraph $H$ inan Erd\H{o}s--R\'enyi random graph over $n$ nodes are rational polynomials in$n$. We present a piece of software named Polcovar (from "polynomial" and"covariance") that computes the exact rational coefficients of thesepolynomials in function of $H$.

Polcovar: Software for Computing the Mean and Variance of Subgraph Counts in Random Graphs