most citedThe Ratio Monotonicity of the -Derangement Numbers

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math.CO2007★ 2 cited

The Ratio Monotonicity of the -Derangement Numbers

William Y. C. Chen, Ernest X. W. Xia

We show that the -derangement numbers satisfy a ratio monotone property, which is analogous to the log-concavity and is stronger than the spiral property and the unimodality.