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 A240650 Number of n X n 0..1 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..1 introduced in row major order 0
 1, 2, 9, 91, 2456, 184819, 37066859, 18940533171, 24272278810439, 77660940030730106 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A240656 LINKS Table of n, a(n) for n=1..10. EXAMPLE Some solutions for n=4 ..0..0..0..0....0..0..0..1....0..0..1..1....0..1..0..0....0..0..0..1 ..0..1..0..0....0..0..0..0....0..0..1..1....1..0..0..0....0..0..0..0 ..0..0..1..0....0..1..0..0....0..0..0..0....0..0..1..0....0..0..0..0 ..1..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....1..0..0..0 CROSSREFS Sequence in context: A266293 A368840 A224323 * A356566 A365363 A011804 Adjacent sequences: A240647 A240648 A240649 * A240651 A240652 A240653 KEYWORD nonn AUTHOR R. H. Hardin, Apr 09 2014 STATUS approved

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Last modified July 19 10:32 EDT 2024. Contains 374392 sequences. (Running on oeis4.)