A250974 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements

71, 12077, 15156945, 139471732486, 9416933752243198, 4665050923272559405591, 16956293118548007574241097692, 452201064244928394467769407865217365, 88482711640559551663354157554544852988982071

Offset

1,1

Comments

Diagonal of A250982

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A115447 A200960 A260034 * A209952 A251382 A208679

Adjacent sequences: A250971 A250972 A250973 * A250975 A250976 A250977

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved