A220919 Equals one maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, diagonal and antidiagonal neighbors in a random 0..2 4Xn array

1, 176, 3299, 61597, 1017676, 16524320, 265639495, 4258349242

Offset

1,2

Comments

Row 4 of A220916

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A077742 A027483 A243647 * A221635 A223411 A068244

Adjacent sequences: A220916 A220917 A220918 * A220920 A220921 A220922

Keyword

nonn

Author

R. H. Hardin Dec 24 2012

Status

approved