A185820 1/5 the number of nX4 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

5, 656, 49036, 4443292, 378212944, 32995092992, 2852526229300, 247462638659680, 21440004040979204, 1858466937288261508, 161065823451839652032, 13959918564726559991320, 1209903218593886396425592

Offset

1,1

Comments

Column 4 of A185825

Links

R. H. Hardin, Table of n, a(n) for n = 1..106

Example

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

Crossrefs

Sequence in context: A203475 A203701 A117709 * A332165 A133750 A203925

Adjacent sequences: A185817 A185818 A185819 * A185821 A185822 A185823

Keyword

nonn

Author

R. H. Hardin Feb 05 2011

Status

approved