

A237408


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


1



5228, 44186, 373804, 3604930, 35476776, 330330878, 3029315052, 28551327846, 271444171644, 2547123932136, 23780590707200, 223518159353886, 2106911371257820, 19790959500035682, 185592593234314976
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OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



