A185824 1/5 the number of nX8 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

181, 3701360, 26231137608, 247462638659680, 2112817100467905536

Offset

1,1

Comments

Column 8 of A185825

Links

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

Example

Some solutions for 4X8 with a(1,1)=0
..0..0..0..0..2..2..2..2....0..0..0..0..4..4..3..3....0..0..0..0..3..3..2..2
..0..1..1..0..0..3..3..1....0..1..1..0..0..1..3..3....0..1..1..0..0..3..3..3
..0..0..0..1..1..0..0..1....0..0..0..1..1..1..4..4....0..0..0..1..1..2..2..2
..1..1..0..0..0..0..1..1....1..1..0..0..0..0..0..4....1..1..0..0..0..0..0..2

Crossrefs

Sequence in context: A107075 A228134 A066626 * A324271 A265997 A204378

Adjacent sequences: A185821 A185822 A185823 * A185825 A185826 A185827

Keyword

nonn

Author

R. H. Hardin Feb 05 2011

Status

approved