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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 21 2013
STATUS
approved

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Last modified June 20 08:48 EDT 2024. Contains 373515 sequences. (Running on oeis4.)