CellularAutomatonData is a Mathematica package containing data on boundaries of one-dimensional cellular automata.
My packages page contains more information, as does my paper with Charles Brummitt.
List of the rightmost 121 central cells on row 231t 1 of rule 30, begun from a single black cell on a white background, for each 1 ≤ t ≤ 211.
It was computed by a Java program and is described in my paper on local nested structure.
(See also sequence A094604.)