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The sequence shows the number of steps that Langton's ant needs to create symmetrical patterns.
Table of n, a(n) for n=1..23.
Clemens Hovekamp, Langton Ameise, symmetrische Muster
Wikipedia, Langton's ant
Sequence in context: A268359 A054181 A163077 * A240080 A194714 A054168
Adjacent sequences: A204807 A204808 A204809 * A204811 A204812 A204813
Clemens Hovekamp, Jan 19 2012