IF LEONARDO OF PISA ONLY KNEW

In 1202 good Leonardo of Pisa introduced these numbers to us [well, not us per se, as we would now be inordinately old] in his Liber Abaci. Some eight hundred and six years later I shall introduce them to the Aquababy -- or at least design the book that will do so.

Thus, the first page of Some Sums, the third of the Aquababy's books: