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A222915 Number of nX4 0..2 arrays with exactly floor(nX4/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
6, 136, 2952, 62336, 1309863, 27663713, 590514107, 12759661261, 278866376604, 6155545744454, 137016855340060, 3071168910680644, 69236193887795927, 1568315505284861894, 35666332338351971086, 813825644002258220522 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A222918

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..55

EXAMPLE

Some solutions for n=3

..0..1..0..1....0..1..1..2....0..1..0..2....0..1..0..0....0..0..1..0

..2..1..1..2....2..2..2..1....0..0..1..0....2..1..1..1....0..0..2..1

..0..2..0..2....0..1..0..2....1..2..0..1....0..2..0..2....1..1..0..2

CROSSREFS

Sequence in context: A196852 A196946 A090407 * A245104 A075185 A003994

Adjacent sequences:  A222912 A222913 A222914 * A222916 A222917 A222918

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 09 2013

STATUS

approved

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Last modified September 21 05:55 EDT 2020. Contains 337267 sequences. (Running on oeis4.)