I posted a five-cell quadratic-growth seed in Serizawa on June 3, 2014. The following day, after discussing smaller candidates with Dave Greene, I posted a clear four-cell example.
The animation runs the clear four-cell seed far past its early transient, from generation 262,144 to 1,048,576. The later triangular region is visible inside the wider expanding pattern. The view is sampled and zoomed out; each pixel represents an occupied 2,048 × 2,048-cell region.
The five-cell seed
The original multistate RLE is:
x = 0, y = 0, rule = Serizawa
B2$3.B2$B15$52.AB!It contains five non-background cells. The original header uses zero dimensions; the cell data extends beyond them.
Four cells
The later example is:
x = 125, y = 18, rule = Serizawa
A13$121.B2$124.B2$121.B!Why the search needed care
Some candidates took millions of generations to reveal new behavior. In the discussion, I noted that my earlier 8,000-generation search horizon had missed late interactions.
The result concerns population growth from a small seed. It is distinct from the engineered Serizawa Geminoid, whose circuitry interprets construction instructions.
These are historical discoveries, with the original configurations supplied in the linked posts.
