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A193500 Number of n X n symmetric 0..3 arrays with no element equal to the product mod 4 of any two of its horizontal and vertical neighbors 0
4, 30, 476, 16922, 1328430, 224738251, 82830799570, 66307508721755, 115414300257319497, 435721788093736397288, 3576788708181112341917385, 63678865525598948282213562255, 2464034493065067438484568541197974 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for 4X4
..3..0..1..1....2..0..1..3....0..3..3..3....3..0..3..2....3..3..3..2
..0..2..3..2....0..3..1..0....3..0..3..3....0..3..0..1....3..3..3..0
..1..3..2..1....1..1..0..3....3..3..3..0....3..0..3..2....3..3..2..3
..1..2..1..2....3..0..3..2....3..3..0..1....2..1..2..3....2..0..3..2
CROSSREFS
Sequence in context: A351795 A290058 A168129 * A163885 A120338 A064050
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 29 2011
STATUS
approved

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Last modified March 28 07:20 EDT 2024. Contains 371235 sequences. (Running on oeis4.)