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 A272966 Number of n X n 0..1 arrays with exactly n+n-2 having value 1 and no three 1's forming an isosceles triangle. 0
 1, 6, 12, 8, 4, 8, 4, 8 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A272973. LINKS EXAMPLE Some solutions for n=3 ..1..1..0. .1..0..1. .0..0..1. .0..1..1. .0..1..1. .1..0..0. .1..0..0 ..0..0..0. .1..0..1. .1..0..1. .0..0..0. .0..0..0. .1..0..0. .1..0..1 ..1..1..0. .0..0..0. .1..0..0. .0..1..1. .1..1..0. .0..1..1. .0..0..1 CROSSREFS Cf. A272973. Sequence in context: A175365 A029769 A074590 * A105730 A213384 A005875 Adjacent sequences:  A272963 A272964 A272965 * A272967 A272968 A272969 KEYWORD nonn AUTHOR R. H. Hardin, May 11 2016 STATUS approved

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Last modified September 23 05:28 EDT 2021. Contains 347609 sequences. (Running on oeis4.)