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

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

Crossrefs

Sequence in context: A025354 A025346 A139230 * A065576 A200071 A203960

Adjacent sequences: A221503 A221504 A221505 * A221507 A221508 A221509

Keyword

nonn

Author

R. H. Hardin Jan 18 2013

Status

approved