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A253757 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal median minus antidiagonal median nondecreasing horizontally and vertically 2
512, 2992, 16544, 82064, 423232, 2154496, 11244672, 58351744, 305405312, 1594118656, 8346515200, 43652413696, 228566467584, 1196268052480, 6263749533696, 32791986405376, 171701217935360, 898982481903616 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A253764

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 6*a(n-1) +12*a(n-2) -96*a(n-3) +384*a(n-5) -192*a(n-6) -384*a(n-7) +256*a(n-8) for n>15

EXAMPLE

Some solutions for n=4

..0..0..0....0..1..0....1..0..1....0..1..0....0..0..1....0..1..1....1..1..1

..1..0..1....0..0..1....1..0..0....1..1..0....1..1..1....0..1..1....0..0..0

..0..1..0....0..0..1....1..0..1....0..0..0....1..1..0....0..0..0....1..0..1

..1..0..1....0..0..0....0..1..0....1..1..0....1..0..0....1..1..0....1..0..1

..0..1..0....0..0..0....0..0..1....1..1..1....0..1..1....0..1..0....1..1..1

..0..0..0....1..0..0....1..0..1....0..1..1....0..1..0....0..0..1....0..0..0

CROSSREFS

Sequence in context: A253794 A253961 A253764 * A250139 A254168 A254457

Adjacent sequences:  A253754 A253755 A253756 * A253758 A253759 A253760

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 11 2015

STATUS

approved

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Last modified May 24 12:01 EDT 2022. Contains 354033 sequences. (Running on oeis4.)