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 A230927 Number of black-square subarrays of (n+2)X(n+2) 0..3 arrays x(i,j) with each element 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
 2, 6, 102, 1242, 98296, 4092246, 1088383766, 159130979900, 148986525600652, 76371552378548280, 250772217069255837720 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A230935 LINKS EXAMPLE Some solutions for n=4 ..x..0..x..2..x..2....x..0..x..2..x..2....x..0..x..0..x..2....x..0..x..0..x..2 ..1..x..3..x..3..x....1..x..3..x..3..x....3..x..1..x..3..x....3..x..1..x..3..x ..x..2..x..0..x..0....x..2..x..0..x..2....x..2..x..0..x..0....x..2..x..2..x..2 ..1..x..1..x..1..x....1..x..3..x..1..x....1..x..1..x..1..x....1..x..3..x..1..x ..x..0..x..2..x..0....x..2..x..2..x..0....x..2..x..0..x..2....x..0..x..0..x..0 ..3..x..3..x..3..x....1..x..1..x..3..x....1..x..3..x..3..x....3..x..3..x..3..x CROSSREFS Sequence in context: A066091 A100704 A123257 * A054247 A278888 A099790 Adjacent sequences:  A230924 A230925 A230926 * A230928 A230929 A230930 KEYWORD nonn AUTHOR R. H. Hardin, Nov 01 2013 STATUS approved

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Last modified August 6 18:59 EDT 2020. Contains 336256 sequences. (Running on oeis4.)