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%I #8 Jul 23 2019 08:49:12
%S 0,1,2,3,2,3,4,5,4,3,2,3,2,3,4,3,4,5,6,5,6,7,6,7,6,5,4,5,6,7,6,7,8,9,
%T 8,7,6,7,6,5,4,3,4,5,6,5,6,5,6,7,6
%N Langton's ant on a circular grid with 4-fold rotational symmetry: number of black cells on the grid after n moves of the ant.
%C On a white circular segment, turn right to the next edge of the segment, flip the color of that segment, then move onto the segment adjacent to that edge.
%C On a black circular segment, turn left to the next edge of the segment, flip the color of that segment, then move onto the segment adjacent to that edge.
%H Felix Fröhlich, <a href="/A309236/a309236.pdf">Illustration of iterations 0-50</a>, 2019.
%e See illustrations in Fröhlich, 2019.
%Y Cf. A255938, A269757, A308590, A308937, A308973, A309064, A326167, A326352.
%K nonn,more
%O 0,3
%A _Felix Fröhlich_, Jul 17 2019
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