A251020 - OEIS

A251020

Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.

110, 2546, 20608, 119632, 516684, 2160510, 7948184, 29146692, 100696896, 345190686, 1144782282, 3748752570, 12009496342, 37949629638

OFFSET

1,1

COMMENTS

Diagonal of A251028

LINKS

EXAMPLE

Some solutions for n=4

..0..1..1..1..2....0..1..1..1..3....0..0..0..0..3....0..0..1..1..3

..0..0..0..0..1....0..0..0..0..2....0..0..0..0..3....3..0..1..0..2

..2..2..2..2..2....0..0..0..0..1....1..1..1..1..2....3..0..1..0..2

..1..0..0..0..0....0..0..0..0..0....2..0..0..0..1....3..0..1..0..1

..2..0..0..0..0....3..3..2..2..1....3..1..1..0..0....3..0..1..0..0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 29 2014

STATUS

approved