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 A235560 Number of (n+1) X (1+1) 0..2 arrays with the difference of the upper and lower median value of each 2 X 2 subblock in lexicographically nondecreasing order rowwise and columnwise. 2
 81, 537, 3199, 17837, 95679, 498597, 2546207, 12796069, 63520287, 312150917, 1521435839, 7364501157, 35440920159, 169704498117, 809104150911, 3843034229093, 18192875333663, 85871684446085, 404259277931583 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 1 of A235565. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 9*a(n-1) -9*a(n-2) -109*a(n-3) +254*a(n-4) +260*a(n-5) -1156*a(n-6) +576*a(n-7) +944*a(n-8) -1024*a(n-9) +256*a(n-10). EXAMPLE Some solutions for n=5 ..1..0....1..1....2..0....2..0....0..0....1..0....0..1....2..2....1..1....1..2 ..0..1....0..0....0..0....1..1....0..0....1..2....1..1....2..2....1..0....1..1 ..0..1....1..2....0..2....2..1....1..0....1..2....1..2....2..0....1..2....1..0 ..0..2....2..1....2..1....2..2....1..0....2..1....2..2....2..2....0..0....1..0 ..1..2....0..0....0..2....1..2....0..1....2..1....1..1....1..0....2..1....2..0 ..1..2....2..2....0..2....0..1....2..2....0..2....2..2....1..0....0..0....0..2 CROSSREFS Cf. A235565. Sequence in context: A253307 A235784 A235565 * A253468 A253462 A206512 Adjacent sequences: A235557 A235558 A235559 * A235561 A235562 A235563 KEYWORD nonn AUTHOR R. H. Hardin, Jan 12 2014 STATUS approved

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Last modified March 4 09:35 EST 2024. Contains 370528 sequences. (Running on oeis4.)