

A220245


Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their kingmove neighbors in a random 0..1 nX4 array


0



4, 37, 816, 7140, 64258, 660677, 6228324, 59704733, 580593280, 5565851685, 53535536290
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OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



