For ahnentafel Number we have a term and definition in Genealogy.

The unique number assigned to each position in an ancestor table is called an ahnentafel number. Number one designates the person in the first generation. Numbers two and three designate the parents of number one and the second generation. Numbers four through seven designate the grandparents of person number one and the third generation. As the ahnentafel extends by generation, the number of persons doubles.
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