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 A203279 Number of n X n binary arrays with every element neighboring horizontally or vertically both a 0 and a 1 1
 0, 4, 28, 676, 72852, 26193924, 31747280900, 124891129720900, 1596519898829489564, 66137923505214401888644, 8881717991453403420376233852, 3865789910670398372168483012783044 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A203285 LINKS R. H. Hardin, Table of n, a(n) for n = 1..15 EXAMPLE Some solutions for n=4 ..1..1..0..1....1..0..1..0....1..0..1..1....1..0..1..1....0..0..1..0 ..0..1..0..1....1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0 ..0..0..0..1....0..1..0..0....1..1..0..0....0..0..0..0....1..0..1..1 ..1..1..0..1....0..1..1..1....0..0..1..1....1..1..1..1....1..0..0..1 CROSSREFS Sequence in context: A091969 A101346 A120604 * A081792 A336622 A354842 Adjacent sequences: A203276 A203277 A203278 * A203280 A203281 A203282 KEYWORD nonn AUTHOR R. H. Hardin Dec 31 2011 STATUS approved

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Last modified July 22 12:22 EDT 2024. Contains 374499 sequences. (Running on oeis4.)