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URL: https://oeis.org/A196857

⇱ A196857 - OEIS

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A196857
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,4,2,0,1 for x=0,1,2,3,4.
0
1, 2, 7, 35, 473, 11280, 494579, 44461736, 7927841482, 2782301025984, 1928382976203757
OFFSET
1,2
COMMENTS
Every 0 is next to 0 3's, every 1 is next to 1 4's, every 2 is next to 2 2's, every 3 is next to 3 0's, every 4 is next to 4 1's
EXAMPLE
Some solutions for n=4:
..0..0..2..2....2..2..2..0....2..2..2..0....2..2..2..2....0..0..1..0
..0..0..2..2....2..0..2..2....2..0..2..2....2..0..0..2....0..1..4..1
..0..0..0..0....2..2..0..2....2..0..0..2....2..0..2..2....2..2..1..0
..0..0..0..0....0..2..2..2....2..2..2..2....2..2..2..0....2..2..0..0
CROSSREFS
Diagonal of A196863.
Sequence in context: A380843 A247240 A266356 * A111908 A060814 A192816
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 06 2011
STATUS
approved