A231048 Number of nX7 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero

0, 1616, 33696, 4110640, 274004640, 22665736960, 1729680196768, 136193662172048, 10596817937397952, 828295717027921136, 64630520730089632896, 5046381265566772229552, 393923451049853535867872

Offset

1,2

Comments

Column 7 of A231049

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..0..1..0..1..2..1..2....0..1..0..1..2..3..0....0..1..0..1..2..3..0
..0..3..2..1..0..3..2....0..3..2..3..2..1..2....0..3..2..3..0..1..0
..0..1..2..1..0..3..0....0..1..2..3..2..1..2....0..1..0..3..0..1..2
..0..3..0..3..2..1..0....0..3..0..1..0..3..0....0..3..2..3..2..3..0

Crossrefs

Sequence in context: A205832 A317397 A236060 * A231423 A252011 A277111

Adjacent sequences: A231045 A231046 A231047 * A231049 A231050 A231051

Keyword

nonn

Author

R. H. Hardin, Nov 03 2013

Status

approved