An arrangement of numbers at the intersection of two sets of perpendicular diagonals such that (for an additive frieze pattern) or (for a multiplicative frieze pattern) in each diamond.

**References**

Conway, J. H. and Coxeter, H. S. M. ``Triangulated Polygons and Frieze Patterns.'' *Math. Gaz.* **57**, 87-94,
1973.

Conway, J. H. and Guy, R. K. In *The Book of Numbers.* New York: Springer-Verlag, pp. 74-76
and 96-97, 1996.

© 1996-9

1999-05-26