A221785 Number of nX6 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns

0, 21, 142, 1325, 13682, 109702, 1104476, 9561346, 89663745

Offset

1,2

Comments

Column 6 of A221787

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=3
..0..2..2..1..0..1....0..2..1..1..1..1....0..2..2..2..1..1....0..2..2..1..1..0
..0..2..2..1..1..0....0..1..2..2..2..0....0..1..1..0..1..0....0..2..1..2..2..0
..1..1..1..1..2..0....0..0..1..2..2..0....0..1..2..2..2..0....1..1..1..1..1..0

Crossrefs

Sequence in context: A200987 A107731 A003702 * A301866 A377166 A101645

Adjacent sequences: A221782 A221783 A221784 * A221786 A221787 A221788

Keyword

nonn

Author

R. H. Hardin Jan 25 2013

Status

approved