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 A253399 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal maximum plus antidiagonal minimum unequal to its neighbors horizontally, vertically and ne+sw antidiagonally 1
 81, 2192, 27362, 403698, 7257328, 196170260, 4643086490, 176392793534, 7735283529732, 473507980691236, 33662526487544248, 4000330502181468930, 385260385567127025928, 74373894362155945768362 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A253407 LINKS R. H. Hardin, Table of n, a(n) for n = 1..15 EXAMPLE Some solutions for n=3 ..1..0..2..2....2..1..1..1....1..0..1..2....0..1..0..0....2..0..1..2 ..1..0..0..0....1..0..2..2....0..1..2..2....2..1..1..0....1..0..0..1 ..2..2..1..0....2..0..0..2....0..0..0..2....1..2..1..1....0..1..2..2 ..2..1..0..1....0..2..1..2....1..2..0..1....0..1..1..0....0..0..0..2 CROSSREFS Sequence in context: A237722 A250436 A237545 * A236820 A237464 A233023 Adjacent sequences:  A253396 A253397 A253398 * A253400 A253401 A253402 KEYWORD nonn AUTHOR R. H. Hardin, Dec 31 2014 STATUS approved

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Last modified January 22 16:37 EST 2020. Contains 331152 sequences. (Running on oeis4.)