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 A253448 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically 0
 81, 1975, 7782, 15730, 44242, 147332, 526430, 1956194, 7444718, 28766354, 112273790, 441202754, 1742089358 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A253456 LINKS EXAMPLE Some solutions for n=4 ..1..1..0..0..1....1..1..2..1..2....1..1..1..1..0....2..2..2..2..2 ..2..2..1..1..2....0..0..1..0..1....1..1..1..1..0....1..1..1..1..1 ..2..2..1..1..2....0..0..1..0..1....2..2..2..2..1....0..0..0..0..0 ..2..2..1..1..2....1..1..2..1..2....1..1..1..1..0....1..1..1..1..1 ..1..1..0..0..2....0..0..1..0..2....2..2..2..2..2....0..0..0..0..0 CROSSREFS Sequence in context: A237957 A238038 A236088 * A205978 A037211 A238237 Adjacent sequences:  A253445 A253446 A253447 * A253449 A253450 A253451 KEYWORD nonn AUTHOR R. H. Hardin, Jan 01 2015 STATUS approved

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Last modified January 18 13:55 EST 2020. Contains 331010 sequences. (Running on oeis4.)