A -cluster is an isolated group of
adjacent (i.e., horizontally or vertically
connected) 1s. Consider a random
(0,1)-matrix whose entries
are 1 (with probability
)
or 0 (with probability
),
with numbers assigned to the edges of a grid. Let
be the total number of "bond"
clusters, then
exists. The analytic value is known for ,
(OEIS A086269; Ziff et al. 1997).