Polynomials s_k(x;λ, μ) which are a generalization of the Boole polynomials, form the Sheffer sequence for g(t) | = | (1 + e^(λ t))^μ f(t) | = | e^t - 1 and have generating function sum_(k = 0)^∞ (s_k(x;λ, μ))/(k!) t^k = [1 + (1 + t)^λ]^(-μ) (1 + t)^x.
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