cp's OEIS Frontend

A207849 Number of 6Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 1 1 1 vertically.

%I A207849 #7 Jul 22 2025 20:53:00
%S A207849 26,676,2080,9672,41444,181896,794768,3479268,15223104,66632488,
%T A207849 291591092,1276262520,5585326656,24445752916,106984774208,
%U A207849 468241205640,2049246237012,8968858409576,39252328435216,171793006303620
%N A207849 Number of 6Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 1 1 1 vertically.
%C A207849 Row 6 of A207845
%H A207849 R. H. Hardin, <a href="/A207849/b207849.txt">Table of n, a(n) for n = 1..210</a>
%F A207849 Empirical: a(n) = 3*a(n-1) +17*a(n-2) -45*a(n-3) -47*a(n-4) +155*a(n-5) -155*a(n-7) +47*a(n-8) +45*a(n-9) -17*a(n-10) -3*a(n-11) +a(n-12) for n>13
%e A207849 Some solutions for n=4
%e A207849 ..1..0..1..1....0..1..1..0....0..1..0..1....1..1..0..1....0..1..1..1
%e A207849 ..1..1..0..1....0..1..0..1....0..1..0..0....0..1..1..0....1..0..1..0
%e A207849 ..0..1..0..0....1..0..1..1....1..0..1..0....1..0..1..0....0..1..0..1
%e A207849 ..1..0..1..0....0..1..1..0....1..0..1..1....1..1..0..1....0..1..0..1
%e A207849 ..1..1..0..1....0..1..0..0....0..1..0..1....0..1..0..1....1..0..1..0
%e A207849 ..0..1..0..1....1..0..1..1....1..0..1..0....1..0..1..0....1..1..0..1
%K A207849 nonn
%O A207849 1,1
%A A207849 _R. H. Hardin_ Feb 21 2012