cp's OEIS Frontend

A207720 Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 0 vertically.

%I A207720 #7 Jul 22 2025 20:43:10
%S A207720 14,196,1414,11970,97580,805154,6614706,54438356,447687702,3682876386,
%T A207720 30292582572,249180165066,2049642453502,16859642486512,
%U A207720 138680722738530,1140735510979302,9383250687334776,77183044399764898,634878161131002558
%N A207720 Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 0 vertically.
%C A207720 Row 5 of A207717
%H A207720 R. H. Hardin, <a href="/A207720/b207720.txt">Table of n, a(n) for n = 1..210</a>
%F A207720 Empirical: a(n) = 4*a(n-1) +37*a(n-2) -3*a(n-3) -132*a(n-4) +26*a(n-5) +132*a(n-6) -59*a(n-7) -15*a(n-8) +6*a(n-9) +a(n-10)
%e A207720 Some solutions for n=4
%e A207720 ..1..0..1..1....1..0..1..0....1..0..1..0....0..1..0..0....0..1..0..0
%e A207720 ..0..1..1..1....1..1..0..0....1..1..0..1....1..1..1..1....1..1..0..1
%e A207720 ..1..0..1..1....1..0..1..0....0..1..1..1....0..1..1..1....1..1..0..0
%e A207720 ..1..1..0..1....1..1..0..0....1..1..1..1....1..0..1..1....1..1..0..1
%e A207720 ..0..1..1..1....1..1..1..0....1..0..1..0....1..1..1..0....1..1..0..0
%K A207720 nonn
%O A207720 1,1
%A A207720 _R. H. Hardin_ Feb 19 2012