A254504 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of four medians of central row, central column, diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally

512, 12324, 373348, 14550580, 801430034, 70328373238, 8348810077730, 1556719261083451, 442940186438236832, 188746754389519521309

Offset

1,1

Comments

Diagonal of A254512

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A200844 A254475 A254768 * A253812 A256947 A254720

Adjacent sequences: A254501 A254502 A254503 * A254505 A254506 A254507

Keyword

nonn

Author

R. H. Hardin, Jan 31 2015

Status

approved