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 A252711 Number of (n+2)X(n+2) 0..3 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order 0
 39, 46, 62, 97, 147, 262, 373, 586, 1012, 1422, 2208, 3820, 5248, 8236, 14216, 19372, 30744, 53228, 72248, 116140, 201800, 273772, 444936, 775948, 1053448, 1726732 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A252719 LINKS Table of n, a(n) for n=1..26. EXAMPLE Some solutions for n=4 ..0..0..1..0..0..1....0..0..1..0..0..1....0..1..0..0..1..0....0..1..1..0..1..1 ..1..0..0..1..0..0....2..1..1..3..1..1....1..1..2..1..1..3....1..0..1..1..0..1 ..2..0..2..2..0..2....1..2..1..1..3..1....3..1..1..2..1..1....2..2..1..2..2..1 ..0..0..1..0..0..1....0..0..1..0..0..1....0..1..0..0..1..0....3..1..1..0..1..1 ..3..0..0..1..0..0....2..1..1..2..1..1....1..1..3..1..1..2....1..3..1..1..0..1 ..2..0..2..2..0..2....1..2..1..1..2..1....2..1..1..3..1..1....2..2..1..2..2..1 CROSSREFS Sequence in context: A236673 A119028 A252712 * A046512 A143746 A064399 Adjacent sequences: A252708 A252709 A252710 * A252712 A252713 A252714 KEYWORD nonn AUTHOR R. H. Hardin, Dec 20 2014 STATUS approved

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Last modified August 7 14:45 EDT 2024. Contains 375012 sequences. (Running on oeis4.)