A220915 Equals one maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, diagonal and antidiagonal neighbors in a random 0..2 nX4 array.

8, 165, 3687, 61597, 1004213, 16172914, 259395789, 4155013023

Offset

1,1

Comments

Column 4 of A220916

Links

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

Example

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

Crossrefs

Sequence in context: A230916 A221078 A205577 * A033454 A181167 A205567

Adjacent sequences: A220912 A220913 A220914 * A220916 A220917 A220918

Keyword

nonn

Author

R. H. Hardin, Dec 24 2012

Status

approved