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 A253488 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally 0
 81, 1377, 4196, 10477, 32652, 113573, 415106, 1561268, 5980490, 23190284, 90686546, 356759588, 1409549210, 5586667004 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A253495 LINKS EXAMPLE Some solutions for n=4 ..1..1..1..2..1....0..2..2..1..2....1..2..2..2..2....1..2..1..1..1 ..2..1..1..2..1....0..1..1..0..1....1..1..1..1..1....1..1..0..0..0 ..2..1..1..2..1....1..2..2..1..2....2..2..2..2..2....2..2..1..1..1 ..1..0..0..1..0....1..2..2..1..2....2..2..2..2..2....1..1..0..0..0 ..2..1..1..2..1....1..2..2..1..2....1..1..1..1..2....1..1..0..1..2 CROSSREFS Sequence in context: A231912 A116205 A237455 * A236738 A236801 A282646 Adjacent sequences:  A253485 A253486 A253487 * A253489 A253490 A253491 KEYWORD nonn AUTHOR R. H. Hardin, Jan 02 2015 STATUS approved

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Last modified July 21 00:49 EDT 2019. Contains 325189 sequences. (Running on oeis4.)