A230925 Number of nX7 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero

0, 162504, 49910578, 79222650048, 95355343910570, 115824906242444524, 141918678589876907858, 173323843525767598735246, 211826848025262254855664570, 258860991517808430443507237776

Offset

1,2

Comments

Column 7 of A230926

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

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

Crossrefs

Sequence in context: A083633 A043649 A282948 * A204653 A031677 A234989

Adjacent sequences: A230922 A230923 A230924 * A230926 A230927 A230928

Keyword

nonn

Author

R. H. Hardin, Nov 01 2013

Status

approved