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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 0
1, 176, 3299, 61597, 1017676, 16524320, 265639495, 4258349242 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 17 06:12 EST 2022. Contains 350378 sequences. (Running on oeis4.)