The numbers used throughout this website identify the person's Ahnentafel number ("A#"), relative to Brian Paul Hoggatt as A#1. Ahnentafel is a German word meaning ancestor-table. Every father in the chart has an A# twice the value of his child. Every mother's A# is twice the child's value plus one.
Several Internet websites define Ahnentafel and can be referenced for a more complete description.