An upper bound on binomial coefficients in the de Moivre-Laplace form

We suggest an upper bound on binomial coefficients that holds over the entire parameter range and whose form repeats the form of the de Moivre-Laplace approximation of the symmetric binomial distribution. Using the bound, we estimate the number of continuations of a given Boolean function to bent functions, investigate dependencies into the Walsh-Hadamard spectra, obtain restrictions on the number of representations as sum of squares of integers bounded in magnitude.

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