A221506 - OEIS

A221506

Number of nX4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction

1, 446, 31663, 2691211, 219689604, 18054912942, 1481559445366, 121595969760961, 9979148121938539, 818972532183106546, 67211557641378928789, 5515926988608836197348

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Column 4 of A221507

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=3

..1..0..1..0....0..2..2..1....0..0..1..1....1..2..0..1....0..1..0..1

..0..3..1..3....2..2..0..1....2..4..1..1....1..0..3..1....2..1..3..2

..2..0..1..0....1..0..1..0....1..0..1..0....1..2..0..0....1..1..0..0