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A266474 Number of 7Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.

%I A266474 #4 Dec 29 2015 20:00:08
%S A266474 8,42,303,2574,22128,175180,1231170,7652503,42460424,212971589,
%T A266474 977395362,4147719749,16420984346,61103700814,215040758842,
%U A266474 719522481940,2299243641848,7043942786447,20758083457211,59015575393057
%N A266474 Number of 7Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.
%C A266474 Row 7 of A266470.
%H A266474 R. H. Hardin, <a href="/A266474/b266474.txt">Table of n, a(n) for n = 1..210</a>
%H A266474 R. H. Hardin, <a href="/A266474/a266474.txt">Empirical polynomial of degree 34</a>
%F A266474 Empirical polynomial of degree 34 (see link above)
%e A266474 Some solutions for n=4
%e A266474 ..0..0..0..1....0..0..1..1....0..0..1..1....0..0..0..1....0..1..1..1
%e A266474 ..0..0..0..1....0..1..1..1....0..1..0..0....0..0..1..0....1..0..1..1
%e A266474 ..0..1..1..0....1..0..0..0....1..0..0..1....0..1..0..0....1..0..1..1
%e A266474 ..1..0..0..1....1..1..0..0....1..0..0..1....1..0..0..0....1..0..1..1
%e A266474 ..1..1..1..0....1..1..0..1....1..1..0..0....1..1..1..1....1..1..0..0
%e A266474 ..1..1..1..0....1..1..1..0....1..1..1..0....1..1..1..1....1..1..0..0
%e A266474 ..1..1..1..1....1..1..1..1....1..1..1..0....1..1..1..1....1..1..0..0
%Y A266474 Cf. A266470.
%K A266474 nonn
%O A266474 1,1
%A A266474 _R. H. Hardin_, Dec 29 2015