A253691 Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically

16, 76, 234, 700, 1632, 3042, 6558, 14710, 30864, 74332, 143078, 301840, 595924, 1315998, 2668860, 6102208, 11569664, 25167926, 48101064, 108872328, 212350500, 492777890, 912037666, 2072968028, 3852486610, 9062325392, 17036265558

Offset

1,1

Comments

Diagonal of A253698

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Example

Some solutions for n=4
..1..0..0..1..1....0..1..0..0..1....1..1..1..1..0....0..1..0..0..1
..0..1..1..0..1....0..0..1..0..0....0..1..0..0..1....0..0..1..0..0
..1..0..1..0..1....1..1..1..0..1....0..0..1..0..0....1..1..1..0..1
..1..0..1..1..0....0..1..1..1..0....1..1..1..0..1....0..1..1..1..0
..1..1..0..0..1....0..1..0..0..0....0..1..1..1..0....0..1..0..0..1

Crossrefs

Sequence in context: A103111 A118862 A118532 * A300919 A007834 A228741

Adjacent sequences: A253688 A253689 A253690 * A253692 A253693 A253694

Keyword

nonn

Author

R. H. Hardin, Jan 09 2015

Status

approved