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A183343 Number of n X n binary arrays with each 1 adjacent to exactly one 0 vertically and one 0 horizontally. 1
1, 7, 16, 63, 594, 6388, 88177, 2078075, 67448514, 3011210310, 200949643314, 19152543505058, 2587734793386622, 506430044756068101, 142259297693953559997, 57178237320333047697665 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A183352.
LINKS
EXAMPLE
Some solutions for 5 X 5
..0..0..0..0..1....1..0..0..0..0....1..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..1..1..0..0....0..1..1..0..1....0..0..0..0..1
..0..0..0..0..0....0..1..1..0..0....0..1..1..0..1....1..0..0..0..1
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....1..0..0..0..0
..1..0..1..1..0....0..1..1..0..0....1..0..0..0..0....0..1..1..0..1
CROSSREFS
Cf. A183352.
Sequence in context: A056613 A318413 A342873 * A318481 A215180 A309476
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 04 2011
STATUS
approved

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Last modified May 19 09:42 EDT 2024. Contains 372683 sequences. (Running on oeis4.)