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 A235885 Number of (n+1) X (n+1) 0..3 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2 X 2 subblock. 0
 40, 232, 1096, 4744, 19720, 80392, 324616, 1304584, 5230600, 20946952, 83836936, 335446024 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A235893. LINKS Table of n, a(n) for n=1..12. FORMULA Empirical: a(n) = 7*a(n-1) -14*a(n-2) +8*a(n-3). EXAMPLE Some solutions for n=4 ..3..2..3..3..3....2..1..3..0..1....0..0..1..0..1....3..1..1..0..1 ..2..3..2..2..2....2..1..3..0..1....0..0..1..0..1....3..1..1..0..1 ..3..2..3..3..3....2..1..3..0..1....1..1..0..1..0....3..1..1..0..1 ..2..3..2..2..2....2..1..3..0..1....1..1..0..1..0....3..1..1..0..1 ..3..2..3..3..3....2..1..3..0..1....1..1..0..1..0....3..1..1..0..1 CROSSREFS Cf. A235893. Sequence in context: A235010 A235290 A074360 * A068790 A073962 A267391 Adjacent sequences: A235882 A235883 A235884 * A235886 A235887 A235888 KEYWORD nonn AUTHOR R. H. Hardin, Jan 16 2014 STATUS approved

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Last modified September 10 03:08 EDT 2024. Contains 375770 sequences. (Running on oeis4.)