An Array , of Positive Integers is called an interspersion if

- 1. The rows of comprise a Partition of the Positive Integers,
- 2. Every row of is an increasing sequence,
- 3. Every column of is a (possibly Finite) increasing sequence,
- 4. If and are distinct rows of and if and are any indices for which , then .

**References**

Kimberling, C. ``Interspersions and Dispersions.'' *Proc. Amer. Math. Soc.* **117**, 313-321, 1993.

Kimberling, C. ``Fractal Sequences and Interspersions.'' *Ars Combin.* **45**, 157-168, 1997.

© 1996-9

1999-05-26