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I am writing a short exposition on the central Delannoy numbers and would like to find the year which Henri Delannoy first introduced them in a formal setting.

I believe Delannoy's initial presentation of the Delannoy numbers was through his article "Emploi de L'echiquier Po'jr la Resolution de Certains Problemes de Probabilities," which can be found on page 70 of this work. However, I cannot read French, and am unsure.

My question: Is this Delannoy's initial presentation of what are now called the Delannoy numbers?

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