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A275117
Direction where Langton's ant is looking after n moves: 1 if looking in starting direction, 2 if looking 90 degrees clockwise from starting direction, 3 if looking 90 degrees counterclockwise from starting direction, or 4 if looking in direction opposite to starting direction.
0
1, 2, 4, 3, 1, 3, 1, 2, 4, 3, 4, 3, 1, 2, 4, 2, 1, 3, 4, 3, 4, 3, 1, 2, 4, 2, 4, 3, 1, 2, 1, 3, 4, 2, 4, 2, 4, 3, 1, 2, 1, 2, 4, 3, 1, 3, 4, 2, 1, 2, 1, 3, 1, 2, 1, 2, 4, 3, 1, 3, 4, 2, 1, 2, 1, 2, 4, 3, 1, 3, 1, 2, 4, 3, 4, 2, 1, 3, 1, 3, 1, 2, 4, 3, 4, 3, 1
OFFSET
0,2
FORMULA
From Andrey Zabolotskiy, Oct 11 2016: (Start)
Let d(n) = (A255938(n) mod 4). Then:
a(n)=1 if d(n)=0,
a(n)=2 if d(n)=1,
a(n)=4 if d(n)=2,
a(n)=3 if d(n)=3.
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
Felix Fröhlich, Jul 18 2016
EXTENSIONS
More terms from Andrey Zabolotskiy, Oct 11 2016
STATUS
approved