

A222915


Number of n X 4 0..2 arrays with exactly floor(n X 4/2) 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
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OFFSET

1,1


COMMENTS



LINKS



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



KEYWORD

nonn


AUTHOR



STATUS

approved



