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 A297295 Number of nXn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 2 neighboring 1s. 1
 1, 1, 3, 10, 49, 495, 13504, 629563, 40753529, 4162842319, 790491998237, 268041967942170, 155466640607601204, 159960976273554094907, 300474954115694463716874, 1003924486221768324971576564 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Diagonal of A297299. LINKS R. H. Hardin, Table of n, a(n) for n = 1..21 EXAMPLE Some solutions for n=5 ..0..0..1..1..0. .0..0..0..0..0. .0..0..0..1..1. .0..1..1..0..0 ..0..1..1..0..0. .0..0..0..0..0. .0..0..1..1..0. .1..1..0..0..0 ..0..0..0..0..0. .0..1..1..0..0. .0..0..0..0..0. .0..1..1..0..0 ..0..0..1..1..0. .1..1..0..1..1. .0..0..0..0..0. .1..1..0..1..1 ..0..1..1..0..0. .0..0..1..1..0. .0..0..0..0..0. .0..0..1..1..0 CROSSREFS Cf. A297299. Sequence in context: A082426 A054381 A102088 * A088142 A276028 A209902 Adjacent sequences:  A297292 A297293 A297294 * A297296 A297297 A297298 KEYWORD nonn AUTHOR R. H. Hardin, Dec 27 2017 STATUS approved

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Last modified March 21 22:19 EDT 2019. Contains 321382 sequences. (Running on oeis4.)