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A197665 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4 0

%I #6 Dec 18 2015 18:17:54

%S 1,9,95,5005,709083,311676959,417293944115,1717065757366333

%N Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4

%C Every 0 is next to 0 4's, every 1 is next to 1 0's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 1's

%C Diagonal of A197672

%e Some solutions for n=4

%e ..2..1..1..1....1..0..0..0....0..1..2..0....0..0..3..0....0..1..2..0

%e ..1..0..0..0....2..0..3..0....1..4..1..0....0..0..0..3....0..1..1..0

%e ..1..0..0..3....1..1..2..0....1..1..1..0....0..0..3..0....1..1..2..0

%e ..1..0..3..0....0..2..1..0....0..0..2..1....1..1..2..1....1..0..0..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Oct 17 2011

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Last modified April 15 04:58 EDT 2024. Contains 371667 sequences. (Running on oeis4.)