A251080 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements.

27, 284, 1165, 4718, 14891, 47932, 139553, 402854, 1109887, 3007772, 7941557, 20638750, 52718963, 132874124, 330624073, 813659558

Offset

1,1

Comments

Diagonal of A251088

Links

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

Example

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

Crossrefs

Sequence in context: A078876 A059603 A224117 * A049011 A115246 A202126

Adjacent sequences: A251077 A251078 A251079 * A251081 A251082 A251083

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved