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A221662 Equals one maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..2 4Xn array 0
1, 128, 2735, 58710, 1016831, 16705642, 268216870, 4294510063, 68718137467, 1099507659647, 17592163496919 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221660

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A236209 A283548 A297687 * A250282 A019564 A224163

Adjacent sequences:  A221659 A221660 A221661 * A221663 A221664 A221665

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 21 2013

STATUS

approved

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Last modified January 17 20:06 EST 2022. Contains 350410 sequences. (Running on oeis4.)