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 A231043 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 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero 0
 0, 2, 50, 2080, 344136, 448752816, 1729680196768, 24300980960474112, 1325427072324524913988 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A231049 LINKS EXAMPLE Some solutions for n=4 ..0..1..0..1....0..3..0..3....0..1..2..1....0..3..0..1....0..1..0..1 ..0..3..2..3....2..1..2..1....0..3..0..1....0..1..2..1....0..3..2..1 ..2..3..0..1....3..0..3..0....0..3..2..3....2..1..2..1....0..3..0..3 ..2..1..2..1....3..2..1..2....2..1..0..1....0..3..0..1....2..1..2..3 CROSSREFS Sequence in context: A246071 A088920 A278456 * A079198 A274485 A210919 Adjacent sequences:  A231040 A231041 A231042 * A231044 A231045 A231046 KEYWORD nonn AUTHOR R. H. Hardin, Nov 03 2013 STATUS approved

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Last modified September 17 22:53 EDT 2019. Contains 327147 sequences. (Running on oeis4.)