A325955 Langton's ant on a three-dimensional grid: number of yellow cells on the grid after n moves of the ant.

0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 4, 4, 4, 5, 5, 5, 5

Offset

0,17

Comments

The ant starts on a completely white grid.

Order of operations: turn 90 degrees, change cell color, move forward one unit.

The rules governing the movement of the ant and the change of cell colors are shown in the following table:

Cell color at | Direction of | Color the cell is

start of iteration | 90-degree turn | changed to

--------------------------------------------------------

white | right | black

black | left | blue

blue | up | yellow

yellow | down | white

Links

Table of n, a(n) for n=0..81.

Felix Fröhlich, Illustration of iterations 0-50 of the ant

Wikipedia, Langton's ant

Example

See illustration in links.

Crossrefs

Cf. A255938, A325953, A325954.

Sequence in context: A125917 A071468 A274886 * A337311 A004571 A204429

Adjacent sequences: A325952 A325953 A325954 * A325956 A325957 A325958

Keyword

nonn,more

Author

Felix Fröhlich, May 28 2019

Extensions

a(51)-a(81) from Charlie Neder, Jun 06 2019

Status

approved