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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 0
21, 2755, 2167173, 10378244309, 301753233626727, 53293289955084658949, 57168347029530545962203193, 372482322079037724494019844619359 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 9 04:13 EST 2022. Contains 358698 sequences. (Running on oeis4.)