A254887 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal median nondecreasing horizontally and vertically

512, 8944, 171400, 4577708, 42268052, 290329276, 1890553676, 6706657300, 27187563600, 107210607174, 372692369806, 1336057750714

Offset

1,1

Comments

Diagonal of A254894

Links

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

Example

Some solutions for n=3
..0..1..0..0..1....0..1..0..1..1....0..0..0..0..1....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..1..1....1..0..0..1..0
..1..1..0..0..1....1..0..0..0..1....1..0..0..1..1....0..0..0..1..0
..0..1..0..1..1....1..0..0..1..1....0..0..1..1..1....0..0..0..1..0
..0..0..0..1..0....0..0..0..1..0....0..0..0..1..1....0..0..1..1..1

Crossrefs

Sequence in context: A070057 A017619 A253928 * A256896 A254234 A254546

Adjacent sequences: A254884 A254885 A254886 * A254888 A254889 A254890

Keyword

nonn

Author

R. H. Hardin, Feb 10 2015

Status

approved