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 A326352 Total number of black cells after n iterations of Langton's ant with two ants on the grid placed side-by-side with one empty square between them and initially looking in the same direction. 11
 0, 2, 4, 6, 8, 6, 6, 6, 6, 8, 6, 8, 10, 12, 14, 12, 12, 12, 12, 14, 12, 12, 12, 12, 14, 12, 14, 16, 18, 20, 18, 18, 16, 16, 18, 16, 18, 20, 22, 24, 22, 22, 22, 22, 24, 22, 22, 22, 22, 24, 22, 24, 26, 28, 30, 28, 28, 26, 26, 28, 28, 30, 30, 32, 34, 34, 36, 34 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS The two ants meet seven times; in that case, the color of the current square is flipped only once. Eventually, both ants build a recurrent highway pattern. - Rémy Sigrist, Jul 28 2019 LINKS Rémy Sigrist, Table of n, a(n) for n = 0..20000 Felix Fröhlich, Illustration of iterations 0-50, 2019. Rémy Sigrist, Representation of the grid after 20000 iterations Rémy Sigrist, PARI program for A326352 Wikipedia, Langton's ant FORMULA a(n + 104) = a(n) + 24 for any n >= 14373. - Rémy Sigrist, Jul 28 2019 EXAMPLE See illustrations in Fröhlich, 2019. PROG (PARI) See Links section. CROSSREFS Cf. A255938, A269757, A308590, A325953, A325954, A325955, A326167, A326353. Sequence in context: A115425 A116418 A122640 * A299479 A185361 A245186 Adjacent sequences:  A326349 A326350 A326351 * A326353 A326354 A326355 KEYWORD nonn AUTHOR Felix Fröhlich, Jun 30 2019 EXTENSIONS More terms from Rémy Sigrist, Jul 28 2019 STATUS approved

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Last modified December 4 13:06 EST 2021. Contains 349526 sequences. (Running on oeis4.)