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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A207587 Number of nX6 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 1 1 vertically.

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%I A207587 #7 Jul 22 2025 20:37:15
%S A207587 26,676,756,3150,9698,25776,70800,204476,596068,1584596,4380740,
%T A207587 12246186,33356536,92744054,250622912,689213304,1904187516,5145503610,
%U A207587 14195771862,38697328208,105556471730,290374890184,787938050420,2162268321240
%N A207587 Number of nX6 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 1 1 vertically.
%C A207587 Column 6 of A207589
%H A207587 R. H. Hardin, <a href="/A207587/b207587.txt">Table of n, a(n) for n = 1..210</a>
%e A207587 Some solutions for n=4
%e A207587 ..0..1..0..1..0..0....1..1..0..1..1..1....1..1..1..0..1..1....1..1..0..1..0..0
%e A207587 ..1..0..1..0..1..1....0..1..1..0..1..0....0..1..0..1..0..0....1..0..1..0..1..0
%e A207587 ..1..1..1..1..1..1....1..0..1..1..0..0....1..0..1..1..1..0....0..1..0..1..1..0
%e A207587 ..0..1..0..1..0..0....1..1..0..1..1..0....1..0..1..0..1..0....0..1..1..1..0..0
%K A207587 nonn
%O A207587 1,1
%A A207587 _R. H. Hardin_ Feb 19 2012