A184367 1/3 the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically

21, 2755, 2167173, 10378244309, 301753233626727, 53293289955084658949, 57168347029530545962203193, 372482322079037724494019844619359

Offset

1,1

Comments

Diagonal of A184376

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A122801 A099680 A352086 * A114934 A098375 A202793

Adjacent sequences: A184364 A184365 A184366 * A184368 A184369 A184370

Keyword

nonn

Author

R. H. Hardin Jan 12 2011

Status

approved