A308563 Langton's ant on a three-dimensional grid: iterations where the ant passes through the origin.

0, 4, 8, 18, 130, 2206, 4326, 4650, 16344, 16814, 47942, 48000, 49928

Offset

1,2

Comments

For the rules applying to this ant, see A325953.

The sequence is finite, with 49928 being the last term. The ant never reaches the origin again after that, since it starts building a highway pattern at iteration 93475.

Links

Table of n, a(n) for n=1..13.

Charlie Neder, Python program for generating this sequence

Crossrefs

Cf. A102358, A325953, A325954, A325955.

Sequence in context: A075797 A351323 A104137 * A272110 A272542 A280114

Adjacent sequences: A308560 A308561 A308562 * A308564 A308565 A308566

Keyword

nonn,fini,full

Author

Felix Fröhlich and Charlie Neder, Jun 07 2019

Status

approved