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by MzxgckZtNqX5i 1502 days ago
Just for consistency: a_n is the coefficient of x^n, so the constant term ends up being a_0. Based on my experience, numbering starts from one (like (x_1, x_2, x_3) as point of R^3) and off-sets from zero, e.g., when dealing with discrete time, t_0 is the first.