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 A278771 Number of n X n 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes. 0
 0, 2, 266, 19750, 1673658, 251740932, 90752836672, 93037538287080, 293564184229043556, 2953569640505846392444 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A278778. LINKS EXAMPLE Some solutions for n=4 ..1..0..0..0. .0..0..0..0. .1..0..0..1. .1..1..0..0. .0..0..1..0 ..1..1..0..1. .1..0..1..0. .1..1..1..1. .0..0..1..1. .1..0..0..0 ..1..1..0..1. .0..0..0..0. .0..0..0..0. .0..0..1..0. .0..0..0..0 ..1..0..0..0. .0..0..0..1. .1..1..1..0. .1..0..1..0. .0..0..1..1 CROSSREFS Cf. A278778. Sequence in context: A135388 A238983 A188964 * A318171 A324596 A007512 Adjacent sequences:  A278768 A278769 A278770 * A278772 A278773 A278774 KEYWORD nonn AUTHOR R. H. Hardin, Nov 28 2016 STATUS approved

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Last modified October 25 18:25 EDT 2020. Contains 338012 sequences. (Running on oeis4.)