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Langton's ant on a three-dimensional grid: iterations where the ant passes through the origin.
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%I #11 Jul 01 2019 16:38:37

%S 0,4,8,18,130,2206,4326,4650,16344,16814,47942,48000,49928

%N Langton's ant on a three-dimensional grid: iterations where the ant passes through the origin.

%C For the rules applying to this ant, see A325953.

%C The sequence is finite, with 49928 being the last term. The ant never reaches the origin again after that, since it starts building a highway pattern at iteration 93475.

%H Charlie Neder, <a href="/A308563/a308563.py.txt">Python program for generating this sequence</a>

%Y Cf. A102358, A325953, A325954, A325955.

%K nonn,fini,full

%O 1,2

%A _Felix Fröhlich_ and _Charlie Neder_, Jun 07 2019