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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 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 29 10:34 EST 2020. Contains 331337 sequences. (Running on oeis4.)