
EXAMPLE

The structure of this irregular triangle is as shown below:
a, b, c;
a, b, c;
a, b, c, a, b, c;
a, b, c, a, b, c, a, b, c, a, b, c;
a, b, c, a, b, c, a, b, c, a, b, c, a, b, c, a, b, c, a, b, c, a, b, c;
...
Every column is associated successively to one of the axes of the triangular grid.
Every row represents a geometric period of the cellular automaton.
So, written as an irregular triangle in which the row lengths are the terms of A011782 multiplied by 3, the sequence begins:
1, 2, 4;
6, 6, 6;
6,10,16,20,16,10;
6,10,16,24,28,32,28,32,40,50,40,22;
8,10,16,24,28,32,32,40,56,74,76,64,42,36,40,62,76,90,80,88,102,122,96,50;
14,10,16,24,28,32,32,40,56,74,76,64,...
...
