

A252900


Number of (n+2)X(2+2) 0..3 arrays with every consecutive three elements in every row and column having exactly two distinct values, and new values 0 upwards introduced in row major order


1



2793, 30453, 306680, 3255537, 33858062, 357165303, 3740990254, 39381278095, 413451112737, 4347775265112, 45683304899259, 480233990713908, 5047003232714437, 53050317963040942, 557570119871186926
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OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

Some solutions for n=2
..0..1..1..2....0..1..1..2....0..1..0..1....0..1..1..0....0..1..0..0
..1..0..1..0....2..0..2..2....1..2..1..1....0..2..2..1....1..0..1..1
..0..0..2..0....2..1..1..0....0..2..0..0....2..2..1..1....1..0..1..0
..1..2..2..1....0..1..1..0....1..3..1..1....2..1..2..2....0..1..0..1


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



