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A278675 Number of nX7 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake. 1

%I #4 Nov 25 2016 15:21:09

%S 56,1050,12727,134265,1378241,14437336,157706284,1809189550,

%T 21622163723,263667893290,3200723946503,37898709431669,

%U 431935945421546,4704720632893357,48828296440609470,482618940316582616

%N Number of nX7 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.

%C Column 7 of A278676.

%H R. H. Hardin, <a href="/A278675/b278675.txt">Table of n, a(n) for n = 1..81</a>

%e Some solutions for n=4

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

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

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

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

%Y Cf. A278676.

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 25 2016

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Last modified July 24 11:31 EDT 2024. Contains 374583 sequences. (Running on oeis4.)