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 A272961 Number of nX4 0..1 arrays with exactly n+4-1 having value 1 and no three 1s forming an isosceles right triangle. 1
 1, 0, 1, 0, 8, 8, 71, 212, 731, 1840, 5953, 18632, 54705, 171348, 511899, 1608540, 4861373, 14726040, 45536993, 138776184, 426552305, 1305642816, 3998654049, 12283464960, 37639150053, 115651510068, 355188064346, 1090663423924 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Column 4 of A272965. LINKS R. H. Hardin, Table of n, a(n) for n = 1..113 EXAMPLE Some solutions for n=6 ..1..1..0..1. .1..1..1..0. .0..1..1..1. .1..0..1..1. .1..0..1..1 ..0..0..0..1. .0..0..0..0. .0..0..0..0. .1..0..0..0. .1..0..0..0 ..0..0..1..0. .0..1..0..0. .0..0..1..0. .0..1..0..0. .0..1..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. .0..0..0..1. .1..0..0..0. .0..0..0..0. .0..0..0..0 ..1..1..1..1. .1..1..0..1. .1..0..1..1. .1..1..1..1. .0..1..1..1 CROSSREFS Cf. A272965. Sequence in context: A183395 A019216 A020552 * A117861 A186984 A298962 Adjacent sequences: A272958 A272959 A272960 * A272962 A272963 A272964 KEYWORD nonn AUTHOR R. H. Hardin, May 11 2016 STATUS approved

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Last modified August 4 08:16 EDT 2024. Contains 374905 sequences. (Running on oeis4.)