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A274370
Let the starting square of Langton's ant have coordinates (0, 0), with the ant looking in negative x-direction. a(n) is the y-coordinate of the ant after n moves.
4
0, 1, 1, 0, 0, -1, -1, 0, 0, -1, -1, -2, -2, -1, -1, 0, 0, -1, -1, -2, -2, -3, -3, -2, -2, -1, -1, -2, -2, -1, -1, -2, -2, -1, -1, 0, 0, -1, -1, 0, 0, 1, 1, 0, 0, -1, -1, 0, 0, 1, 1, 0, 0, 1, 1, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 2, 2, 1, 1, 2, 2, 1, 1, 2
OFFSET
0,12
LINKS
FORMULA
a(n+104) = a(n) - 2 for n > 9975. - Andrey Zabolotskiy, Jul 05 2016
CROSSREFS
Cf. A274369 (x-coordinate).
Sequence in context: A089617 A359217 A359216 * A128521 A090477 A349802
KEYWORD
sign,look
AUTHOR
Felix Fröhlich, Jun 19 2016
STATUS
approved