A253732 Number of (n+2)X(n+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal sum minus antidiagonal sum unequal to its neighbors horizontally and vertically.

218, 1888, 7216, 54688, 400068, 3369876, 40265740, 774250356, 16204708792, 401697467244, 13688214787176, 637511964938288, 35097886281624988

Offset

1,1

Comments

Diagonal of A253740

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Sequence in context: A241102 A292545 A321115 * A232513 A224741 A209824

Adjacent sequences: A253729 A253730 A253731 * A253733 A253734 A253735

Keyword

nonn

Author

R. H. Hardin, Jan 11 2015

Status

approved