A185407 1/7 the number of nX4 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

7, 1848, 279918, 53808534, 9560464068, 1755419411964, 318289797234978, 58009184105051760, 10550717546713596858, 1920558372882730002666, 349484670721711744198032, 63604421284059206327321532

Offset

1,1

Comments

Column 4 of A185409

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

Some solutions for 3X4 with a(1,1)=0
..0..0..6..6....0..0..0..5....0..0..5..4....0..3..3..1....0..0..0..0
..3..1..1..1....0..2..3..5....4..3..5..4....0..3..0..1....3..3..3..2
..3..3..4..4....0..2..3..3....4..3..3..3....0..3..0..0....3..6..6..2

Crossrefs

Sequence in context: A117661 A206459 A172937 * A332303 A145253 A248730

Adjacent sequences: A185404 A185405 A185406 * A185408 A185409 A185410

Keyword

nonn

Author

R. H. Hardin Jan 26 2011

Status

approved