A221232 Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2

4, 852, 54075, 3618339, 245539157, 16783348483, 1149649557942, 78781028973610, 5398115263510454, 369826510764450212, 25333832048380716784, 1735268265292767301022, 118852327360929428638771

Offset

1,1

Comments

Column 4 of A221234

Links

R. H. Hardin, Table of n, a(n) for n = 1..46

Example

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

Crossrefs

Sequence in context: A349067 A176186 A332184 * A272167 A255269 A113896

Adjacent sequences: A221229 A221230 A221231 * A221233 A221234 A221235

Keyword

nonn

Author

R. H. Hardin Jan 05 2013

Status

approved