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A181223 Number of nX7 binary matrices with no three 1's adjacent in a line horizontally, vertically, diagonally or antidiagonally.

%I A181223 #5 Jul 22 2025 08:36:57
%S A181223 81,6561,179097,7426986,316896477,12297765846,493466099722,
%T A181223 19886730240632,794878208506289,31852650059853831,1277093175893680596,
%U A181223 51166967011661264756,2050407503529684003122,82170493913101130433607
%N A181223 Number of nX7 binary matrices with no three 1's adjacent in a line horizontally, vertically, diagonally or antidiagonally.
%C A181223 Column 7 of A181224
%H A181223 R. H. Hardin, <a href="/A181223/b181223.txt">Table of n, a(n) for n=1..175</a>
%e A181223 Some avoided solutions for 3X7
%e A181223 ..1..0..0..0..0..1..0....0..0..0..0..0..0..0....0..1..0..1..0..0..0
%e A181223 ..1..0..0..0..0..0..0....1..1..1..0..0..0..0....0..0..0..0..1..0..0
%e A181223 ..1..0..0..0..0..0..0....1..0..0..0..0..0..0....0..0..0..0..0..1..0
%K A181223 nonn
%O A181223 1,1
%A A181223 _R. H. Hardin_ Oct 10 2010