

A237966


Number of (n+1)X(n+1) 0..3 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one


0




OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



