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 A272959 Number of nXn 0..1 arrays with exactly n+n-1 having value 1 and no three 1s forming an isosceles right triangle. 0
 1, 0, 0, 0, 12, 192, 4892, 230268 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Diagonal of A272965. LINKS EXAMPLE Some solutions for n=6 ..1..1..1..0..0..0. .0..0..0..0..1..1. .1..0..0..0..0..1. .0..0..1..0..0..1 ..0..0..0..1..1..0. .1..0..0..1..0..0. .1..0..1..0..0..1. .1..0..0..0..0..1 ..0..0..0..0..0..1. .1..0..0..0..0..0. .0..0..0..0..0..1. .1..0..0..0..0..0 ..0..0..0..0..0..1. .1..0..0..0..0..0. .0..0..0..0..0..1. .0..0..0..0..1..0 ..1..0..0..0..0..1. .0..1..0..0..0..0. .0..0..0..0..1..0. .1..0..0..0..0..1 ..0..1..0..0..0..1. .0..0..1..1..1..1. .0..1..1..1..0..0. .0..0..1..1..0..1 CROSSREFS Cf. A272965. Sequence in context: A212596 A051620 A144347 * A095351 A061065 A210356 Adjacent sequences:  A272956 A272957 A272958 * A272960 A272961 A272962 KEYWORD nonn AUTHOR R. H. Hardin, May 11 2016 STATUS approved

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Last modified August 17 23:07 EDT 2018. Contains 313817 sequences. (Running on oeis4.)