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 A269208 Number of nXn 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once. 0
 0, 96, 18048, 12548544, 30541426560, 292321215814512, 11273191243423937904, 1787171501783334054571344, 1177416215650225851496983234096, 3247635013385894059877839733594599296 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A269214. LINKS EXAMPLE Some solutions for n=3 ..0..2..3. .3..0..0. .1..3..2. .2..0..0. .0..0..0. .1..2..2. .1..3..1 ..0..2..2. .1..1..1. .2..2..2. .1..0..1. .0..1..3. .3..3..2. .1..3..3 ..3..1..0. .3..3..1. .2..3..3. .0..3..2. .3..1..1. .2..3..2. .1..1..0 CROSSREFS Cf. A269214. Sequence in context: A208443 A183418 A299950 * A295597 A203489 A208794 Adjacent sequences:  A269205 A269206 A269207 * A269209 A269210 A269211 KEYWORD nonn AUTHOR R. H. Hardin, Feb 20 2016 STATUS approved

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Last modified September 20 04:06 EDT 2019. Contains 327212 sequences. (Running on oeis4.)