A253319 - OEIS

A253319

Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw

16, 126, 1217, 7744, 58505, 283804, 1660088, 6753250, 32941939, 123940122, 544975707, 2033911736, 8556436417, 32990467558, 137911795230

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OFFSET

1,1

COMMENTS

Diagonal of A253326

LINKS

EXAMPLE

Some solutions for n=4

..0..0..0..0..1....0..1..0..0..0....0..0..0..0..0....0..0..0..0..0

..1..0..1..0..0....0..0..0..1..1....0..0..0..0..0....0..0..0..1..0

..0..0..0..0..1....0..1..0..1..0....1..0..1..0..1....1..0..1..0..1

..0..1..0..1..1....1..0..1..1..1....1..0..1..0..1....0..1..0..1..1

..0..1..1..1..1....0..1..1..0..1....0..1..1..1..1....1..0..1..1..0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 30 2014

STATUS

approved