A253954 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal median minus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally.

512, 20868, 1501724, 240903042, 77993064012, 54401550145686, 78151552269875720, 232106691536153580818, 1434896543229609953653472, 18395963378201546364490900139, 489591524753759022642241209084588

Offset

1,1

Comments

Diagonal of A253961

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

Some solutions for n=2
..0..1..1..0....0..1..1..1....1..1..1..1....1..0..1..0....0..0..1..0
..1..1..0..0....1..0..1..0....0..0..0..0....0..0..0..1....1..1..0..0
..1..1..0..1....1..0..0..0....1..0..0..0....0..0..0..1....0..0..1..0
..0..1..0..1....1..0..1..0....0..1..0..1....1..0..1..0....1..0..0..1

Crossrefs

Sequence in context: A186831 A236215 A254182 * A264108 A254353 A253793

Adjacent sequences: A253951 A253952 A253953 * A253955 A253956 A253957

Keyword

nonn

Author

R. H. Hardin, Jan 20 2015

Status

approved