A251129 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements

40, 416, 1997, 8008, 25597, 79226, 223663, 620524, 1653313, 4340190, 11150995, 28282512, 70727013, 174943234, 428129015, 1038115892

Offset

1,1

Comments

Diagonal of A251137

Links

Table of n, a(n) for n=1..16.

Example

Some solutions for n=4
..0..0..0..0..2....0..0..0..1..2....0..0..2..2..2....0..1..0..2..2
..1..1..1..1..2....0..0..0..0..1....2..0..1..0..0....0..1..0..2..0
..0..0..0..0..1....2..0..0..0..1....2..0..1..0..0....0..1..0..2..0
..0..0..0..0..0....2..0..0..0..1....2..0..1..0..0....0..1..0..2..0
..1..1..1..1..0....2..0..0..0..1....2..0..1..0..0....2..1..0..2..0

Crossrefs

Sequence in context: A253132 A293969 A168192 * A007772 A228122 A247408

Adjacent sequences: A251126 A251127 A251128 * A251130 A251131 A251132

Keyword

nonn

Author

R. H. Hardin, Nov 30 2014

Status

approved