A254484 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal minimum nondecreasing horizontally, vertically and ne-to-sw antidiagonally

512, 29952, 3912576, 1018596736, 615887502592, 871411470160000, 2791393651770044928, 20834584212281010642048, 359773454516444702380773120, 14455392568428580152969089843072, 1342532863362457191125034598691859456

Offset

1,1

Comments

Diagonal of A254491

Links

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

Example

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

Crossrefs

Sequence in context: A250496 A254160 A254450 * A253864 A308815 A253536

Adjacent sequences: A254481 A254482 A254483 * A254485 A254486 A254487

Keyword

nonn

Author

R. H. Hardin, Jan 31 2015

Status

approved