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 A236720 Number of (n+1)X(n+1) 0..2 arrays with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock equal 0
 81, 639, 6879, 127113, 3413516, 173486981, 12274465993, 2038592272997, 393572287740663 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A236728 LINKS EXAMPLE Some solutions for n=4 ..0..1..0..1..0....1..1..0..2..1....2..1..1..1..0....0..1..0..1..0 ..1..1..1..1..1....0..2..1..1..0....1..2..0..2..1....2..2..2..2..2 ..0..1..2..1..0....1..1..0..2..1....2..1..1..1..2....2..1..0..1..2 ..1..1..1..1..1....0..2..1..1..0....1..2..0..2..1....0..2..2..2..2 ..1..0..1..2..1....1..1..0..2..1....1..0..2..0..1....1..2..1..0..1 CROSSREFS Sequence in context: A185856 A185848 A237629 * A187441 A187433 A269055 Adjacent sequences:  A236717 A236718 A236719 * A236721 A236722 A236723 KEYWORD nonn AUTHOR R. H. Hardin, Jan 30 2014 STATUS approved

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Last modified August 5 07:21 EDT 2020. Contains 336209 sequences. (Running on oeis4.)