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 A205423 Number of (n+1)X(n+1) 0..3 arrays with the number of equal 2X2 subblock diagonal pairs and equal antidiagonal pairs differing from each horizontal or vertical neighbor, and new values 0..3 introduced in row major order 0
 15, 1662, 1093244, 3163254256, 42782998259850 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A205431 LINKS Table of n, a(n) for n=1..5. EXAMPLE Some solutions for n=4 ..0..0..0..1..1....0..1..1..1..2....0..0..0..0..0....0..0..0..1..1 ..2..1..0..2..1....1..2..3..1..2....0..0..1..1..0....2..2..0..1..3 ..3..2..3..0..0....2..1..2..1..1....0..2..1..0..1....1..2..1..0..3 ..0..1..2..1..0....0..2..1..3..0....2..0..2..0..0....3..3..2..2..0 ..2..0..3..2..3....2..0..3..1..3....0..3..3..2..3....2..3..2..2..3 CROSSREFS Sequence in context: A208000 A182925 A208020 * A263600 A208860 A195891 Adjacent sequences: A205420 A205421 A205422 * A205424 A205425 A205426 KEYWORD nonn AUTHOR R. H. Hardin Jan 27 2012 STATUS approved

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Last modified November 29 11:25 EST 2023. Contains 367429 sequences. (Running on oeis4.)