Rule 126 is one of the elementary cellular automaton rules introduced by Stephen Wolfram in 1983 (Wolfram 1983, 2002). It
specifies the next color in a cell, depending on its color and its immediate neighbors.
Its rule outcomes are encoded in the binary representation
. This rule is illustrated
above together with the evolution of a single black cell it produces after 15 steps
(Wolfram 2002, p. 55).
Rule 126 is amphichiral, and its complement is rule 129.
Starting with a single black cell, successive generations 
, 1, ... are given by interpreting the numbers 1, 7, 27,
127, 387, 1935, 6579, 32767, ... in binary, namely 1, 111, 11011, 1111111, 110000011,
....
