

A237459


Number of (n+1)X(4+1) 0..2 arrays with the maximum plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one


1



4272, 25974, 125998, 594190, 2864838, 14469792, 71637702, 345945382, 1692387998, 8423481016, 41623347902, 203854940676, 1002036877470, 4949498743130, 24401744486702, 120014028398474, 590821956837072, 2912112513596448
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OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



