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URL: https://oeis.org/A231240

⇱ A231240 - OEIS

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A231240
Number of n X n 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero.
0
0, 2, 78, 5992, 1872136, 2532190370, 13176773912306, 263345856214302416, 20480387479891154414778
OFFSET
1,2
COMMENTS
Diagonal of A231246
EXAMPLE
Some solutions for n=4
..0..3..0..3....0..1..2..1....0..3..0..3....0..1..2..1....0..3..2..3
..2..1..2..1....0..1..2..3....0..1..0..3....2..1..2..3....0..1..0..3
..2..3..2..1....2..1..0..3....2..3..0..1....0..3..0..3....0..1..0..3
..0..1..0..3....0..3..2..1....2..1..2..3....2..1..0..3....0..1..2..3
CROSSREFS
Sequence in context: A184965 A157062 A008273 * A392485 A197101 A245674
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 06 2013
STATUS
approved