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Number of nX5 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.
1

%I #4 Nov 28 2016 08:20:13

%S 6,503,10784,150085,1673658,16205001,141166787,1126917480,8340736743,

%T 57745890265,376707516550,2329550843590,13722943412752,77304542920321,

%U 417679484040714,2169521229525151,10853156575543255,52367994237483811

%N Number of nX5 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

%C Column 5 of A278778.

%H R. H. Hardin, <a href="/A278775/b278775.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A278775/a278775.txt">Empirical polynomial of degree 69</a>

%F Empirical polynomial of degree 69 (see link above)

%e Some solutions for n=4

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

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

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

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

%Y Cf. A278778.

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 28 2016