cp's OEIS Frontend

A207857 Number of nX7 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically.

%I A207857 #7 Jul 22 2025 20:53:45
%S A207857 40,1600,13230,178088,2047902,24999522,298294290,3584335104,
%T A207857 42968437070,515629329072,6185911022388,74218338931926,
%U A207857 890410143869610,10682416271430446,128158495357747566,1537548202464027744
%N A207857 Number of nX7 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically.
%C A207857 Column 7 of A207858
%H A207857 R. H. Hardin, <a href="/A207857/b207857.txt">Table of n, a(n) for n = 1..210</a>
%e A207857 Some solutions for n=4
%e A207857 ..0..0..1..1..1..0..1....1..0..1..1..1..0..0....1..0..0..1..1..1..0
%e A207857 ..1..1..1..0..1..1..0....0..1..1..1..1..0..1....0..1..1..0..1..1..0
%e A207857 ..1..1..1..0..1..1..0....0..1..1..1..0..1..1....0..1..1..0..0..1..1
%e A207857 ..1..1..0..0..1..1..1....0..0..1..1..0..1..1....0..1..1..0..0..1..1
%K A207857 nonn
%O A207857 1,1
%A A207857 _R. H. Hardin_ Feb 21 2012