A221295 - OEIS

A221295

Equals two maps: number of 7Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 7Xn array

1, 1081, 119972, 22931365, 4129628435, 618825190371

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Row 7 of A221290

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=3

..0..1..0....0..0..1....0..0..0....0..0..0....0..0..0....0..1..0....0..0..0

..1..0..0....0..0..1....0..1..1....1..1..1....0..1..1....1..0..1....0..0..1

..0..0..1....1..0..0....0..1..1....0..1..1....1..0..0....1..0..0....1..0..1

..0..0..0....0..0..0....0..0..0....0..1..1....0..0..0....0..0..0....1..0..1

..0..0..1....1..1..0....0..0..1....0..0..1....1..1..1....0..1..1....1..0..1

..1..0..0....1..1..0....1..0..0....1..0..0....0..1..1....0..1..1....0..1..0

..0..1..0....0..0..0....0..1..0....1..0..0....0..1..0....0..1..0....0..0..0

CROSSREFS

Sequence in context: A078214 A251199 A220334 * A220687 A188240 A165809

Adjacent sequences: A221292 A221293 A221294 * A221296 A221297 A221298

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 09 2013

STATUS

approved