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 A183323 Number of n X n binary arrays with each 1 adjacent to exactly two other 1s 0
 1, 2, 6, 27, 289, 4740, 128371, 6115158, 505971397, 73890230419, 19136191954838, 8704355999401819, 6908686513461201175, 9552034660752931158279 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A183328 LINKS EXAMPLE Some solutions for 6X6 ..1..1..1..0..0..0....0..1..1..1..1..0....0..0..0..1..1..1....0..0..1..1..1..1 ..1..0..1..0..1..1....0..1..0..0..1..1....0..0..1..1..0..1....0..0..1..0..0..1 ..1..0..1..0..1..1....1..1..0..0..0..1....0..1..1..0..1..1....1..1..1..0..0..1 ..1..1..1..0..0..0....1..0..0..0..1..1....0..1..0..1..1..0....1..0..0..0..0..1 ..0..0..0..1..1..0....1..1..0..1..1..0....0..1..0..1..0..0....1..0..0..0..1..1 ..0..0..0..1..1..0....0..1..1..1..0..0....0..1..1..1..0..0....1..1..1..1..1..0 CROSSREFS Sequence in context: A003513 A113731 A113676 * A153253 A174880 A303394 Adjacent sequences:  A183320 A183321 A183322 * A183324 A183325 A183326 KEYWORD nonn AUTHOR R. H. Hardin Jan 03 2011 STATUS approved

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Last modified August 19 10:38 EDT 2022. Contains 356228 sequences. (Running on oeis4.)