A183360 One quarter the number of nX8 1..4 arrays with no two neighbors of any element equal to each other

2916, 147456, 104976, 166464, 331776, 746496, 1806336, 4460544, 9437184, 19501056, 40144896, 84934656, 180633600, 391090176, 840536064, 1816805376, 3893760000, 8387629056, 17960288256, 38654705664, 82833444864, 178259595264

Offset

1,1

Comments

Column 8 of A183362

Links

R. H. Hardin, Table of n, a(n) for n = 1..38

Example

Some solutions for 5X8 with a(1,1)=1
..1..2..2..3..1..2..2..1....1..2..4..4..1..2..4..4....1..3..4..1..2..2..4..3
..1..3..4..4..1..3..4..4....1..3..3..2..1..3..3..2....2..2..4..1..3..3..4..1
..4..3..1..2..2..3..1..2....4..4..1..2..4..4..1..2....4..1..3..2..4..1..2..2
..2..2..1..3..4..4..1..2....2..2..1..3..3..2..1..3....4..1..3..2..4..1..3..3
..3..4..4..3..1..2..3..4....3..3..4..4..1..2..4..4....2..2..4..1..3..2..4..1

Crossrefs

Sequence in context: A334002 A344474 A203376 * A209046 A209018 A186562

Adjacent sequences: A183357 A183358 A183359 * A183361 A183362 A183363

Keyword

nonn

Author

R. H. Hardin Jan 04 2011

Status

approved