A185823 1/5 the number of n X 7 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

65, 426928, 956312244, 2852526229300, 7662203273902712

Offset

1,1

Comments

Column 7 of A185825.

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 4 X 7 with a(1,1)=0
..0..0..0..3..3..1..2....0..0..0..2..2..2..0....0..0..0..1..4..4..0
..0..1..0..1..2..1..2....0..1..0..1..1..0..0....0..1..0..1..3..3..0
..0..1..0..1..2..1..2....0..1..0..1..0..1..1....0..1..0..1..0..4..4
..0..0..0..1..0..0..2....0..0..0..1..0..0..0....0..0..0..1..0..3..3

Crossrefs

Cf. A185825.

Sequence in context: A015072 A015039 A238612 * A035519 A368189 A238842

Adjacent sequences: A185820 A185821 A185822 * A185824 A185825 A185826

Keyword

nonn

Author

R. H. Hardin, Feb 05 2011

Status

approved