A184144 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically

43, 17203, 58656073, 1764076701091, 464796062784203293, 1074317319424680321399811

Offset

1,1

Comments

Diagonal of A184153

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 3X3 with a(1,1)=0
..0..2..2....0..2..3....0..2..2....0..1..1....0..3..1....0..0..0....0..2..3
..0..0..0....3..3..3....0..2..3....1..1..1....1..3..2....0..2..2....0..2..2
..2..3..3....2..1..2....3..2..0....2..3..2....2..3..3....0..2..0....2..2..0

Crossrefs

Sequence in context: A183489 A361892 A356203 * A262856 A302484 A177488

Adjacent sequences: A184141 A184142 A184143 * A184145 A184146 A184147

Keyword

nonn

Author

R. H. Hardin Jan 09 2011

Status

approved