A254887 - OEIS

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

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OFFSET

1,1

COMMENTS

Diagonal of A254894

LINKS

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

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 10 2015

STATUS

approved