A231656 Number of n X n 0..2 arrays with no element less than a strict majority of its horizontal, vertical and antidiagonal neighbors

3, 15, 1197, 345519, 434469343, 2825994465190, 92942728755412088, 14666832942979847986346, 11206356242764353017982723900

Offset

1,1

Comments

Diagonal of A231663

Links

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

Example

Some solutions for n=3
..2..1..0....0..2..0....1..0..1....2..0..0....0..1..0....1..0..0....2..0..0
..0..0..0....0..0..0....0..0..2....1..0..0....0..0..0....0..0..0....0..0..0
..0..2..1....2..2..0....0..1..1....1..2..0....2..2..1....1..2..0....0..0..0

Crossrefs

Sequence in context: A272353 A012766 A012796 * A096368 A016066 A012848

Adjacent sequences: A231653 A231654 A231655 * A231657 A231658 A231659

Keyword

nonn

Author

R. H. Hardin, Nov 12 2013

Status

approved