B13/S

[ebcube]

Starting with a single dot, this rule creates an intricate mosaic using only five distinct "pieces" every (2^n) - 1 generations, separated by a simple margin, leaving absolutely no holes. These are those pieces:

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x = 28, y = 7, rule = B13/S
$9b2o3b2o$10bo3bo$8b3o3b3o7b3o$b2o3bobo7bo7bobo$bo4b3o6b2o3bo3b3o!

[William Leonard]

At first glance, that reminded me of the Replicator rule.

Something a bit cooler:

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#CXRLE Pos=-6,-4
x = 9, y = 9, rule = B13/S
bo5bo$3o3b3o$bo5bo$3b3o$3bobo$3b3o$bo5bo$3o3b3o$bo5bo!

At least it's symmetrical...

[Tropylium]

At first glance, that reminded me of the Replicator rule.

I think the evolution of a single dot is indeed identical in this rule and Replicator; B5, B7, and S<odd> neighborhoods never come up here.