A197101 Half the number of n X n 0..3 arrays with no element equal to the average of its horizontal and vertical neighbors

2, 78, 50831, 478107878, 63216096026066, 117783697209668555853

Offset

1,1

Comments

Diagonal of A197109

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 4X4
..1..0..0..0....1..0..3..0....1..0..3..2....1..0..3..2....1..0..2..0
..0..0..1..1....0..0..1..1....0..0..0..3....0..0..2..0....0..0..2..2
..0..0..0..0....0..1..3..3....0..1..1..3....0..1..1..2....0..1..2..3
..1..1..1..1....0..2..0..0....1..0..1..3....1..0..1..3....1..3..3..1

Crossrefs

Sequence in context: A157062 A008273 A231240 * A245674 A342979 A166052

Adjacent sequences: A197098 A197099 A197100 * A197102 A197103 A197104

Keyword

nonn

Author

R. H. Hardin Oct 10 2011

Status

approved