Let be the number of black boxes, the length of a side of a box, and
the fractional area
of black boxes after the th
iteration, then
(2)
(3)
(4)
(5)
The number of black squares after , 1, 2, ... iterations is therefore 1, 4, 16, 64, 256, 1024,
4096, 16384, ... (OEIS A000302). The capacity
dimension is therefore