A230898 Number of nX7 0..3 arrays x(i,j) with each element horizontally or vertically 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, 186, 3706, 190364, 8554562, 400106488, 18831479468, 887265863604, 41898727967522, 1978685791204552, 93492250825825256, 4417805614428299566, 208779099851162991776, 9866957125308860636000, 466327790501046362443268

Offset

1,2

Comments

Column 7 of A230899

Links

R. H. Hardin, Table of n, a(n) for n = 1..22

Example

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

Crossrefs

Sequence in context: A289301 A147817 A318270 * A241942 A161619 A206515

Adjacent sequences: A230895 A230896 A230897 * A230899 A230900 A230901

Keyword

nonn

Author

R. H. Hardin, Oct 31 2013

Status

approved