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A278669 Number of n X n 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake. 0

%I #6 Apr 21 2020 12:53:54

%S 0,8,158,2650,55854,1998526,157706284,32788533228,19802007716084,

%T 36574110002226508

%N Number of n X n 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.

%C Diagonal of A278676.

%e Some solutions for n=4

%e ..1..1..0..0. .1..1..0..0. .0..0..1..1. .0..0..0..0. .1..0..0..0

%e ..1..1..0..0. .1..0..1..0. .1..0..1..1. .0..0..0..0. .0..1..1..0

%e ..1..1..1..0. .1..0..1..0. .1..1..1..0. .1..0..1..0. .1..1..1..0

%e ..1..1..0..0. .1..1..0..0. .1..1..1..1. .1..1..0..1. .1..1..1..0

%Y Cf. A278676.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 25 2016

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Last modified September 5 03:34 EDT 2024. Contains 375686 sequences. (Running on oeis4.)