A253757 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal median minus antidiagonal median nondecreasing horizontally and vertically

512, 2992, 16544, 82064, 423232, 2154496, 11244672, 58351744, 305405312, 1594118656, 8346515200, 43652413696, 228566467584, 1196268052480, 6263749533696, 32791986405376, 171701217935360, 898982481903616

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