A309236 - OEIS

A309236

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.

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, 8, 7, 6, 7, 6, 5, 4, 3, 4, 5, 6, 5, 6, 5, 6, 7, 6

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

COMMENTS

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.

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.

LINKS

Table of n, a(n) for n=0..50.

Felix Fröhlich, Illustration of iterations 0-50, 2019.

EXAMPLE

See illustrations in Fröhlich, 2019.

CROSSREFS

Cf. A255938, A269757, A308590, A308937, A308973, A309064, A326167, A326352.

Sequence in context: A361838 A213183 A125929 * A071933 A209802 A064672

Adjacent sequences: A309233 A309234 A309235 * A309237 A309238 A309239

KEYWORD

nonn,more

AUTHOR

Felix Fröhlich, Jul 17 2019

STATUS

approved