A185555 1/3 the number of nX5 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

5, 576, 25496, 1317540, 64354744, 3228500154, 160107914496, 7976049592892, 396657534279472, 19739291980979494, 982052247478709716, 48863217617236925408, 2431151644944154928564, 120961982929570366777114

Offset

1,1

Comments

Column 5 of A185559

Links

R. H. Hardin, Table of n, a(n) for n = 1..171

Example

Some solutions for 4X5 with a(1,1)=0
..0..0..0..1..2....0..0..1..1..0....0..0..1..2..2....0..0..0..1..1
..0..2..2..1..2....0..1..0..0..0....0..2..1..1..1....0..1..2..2..2
..0..1..2..0..0....0..1..1..2..1....0..2..0..0..2....0..1..1..0..0
..1..1..2..1..1....0..2..2..2..1....2..2..1..1..2....0..2..2..0..0

Crossrefs

Sequence in context: A298844 A298651 A299605 * A093941 A072952 A179634

Adjacent sequences: A185552 A185553 A185554 * A185556 A185557 A185558

Keyword

nonn

Author

R. H. Hardin Jan 31 2011

Status

approved