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A208424 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically.

%I A208424 #7 Jul 22 2025 21:21:28
%S A208424 25,625,2625,26375,161975,1297475,8948825,67061525,479579725,
%T A208424 3521095775,25468906525,185793853675,1348779310025,9818938648875,
%U A208424 71365135739875,519177351902675,3774912413288375,27456054751647025,199657967390334825
%N A208424 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically.
%C A208424 Row 7 of A208420
%H A208424 R. H. Hardin, <a href="/A208424/b208424.txt">Table of n, a(n) for n = 1..210</a>
%F A208424 Empirical: a(n) = 52*a(n-2) +80*a(n-3) -477*a(n-4) -656*a(n-5) +1489*a(n-6) +1910*a(n-7) -1775*a(n-8) -2192*a(n-9) +812*a(n-10) +984*a(n-11) -120*a(n-12) -144*a(n-13)
%e A208424 Some solutions for n=4
%e A208424 ..1..1..1..1....1..0..1..0....0..1..0..1....1..1..0..1....1..1..1..0
%e A208424 ..1..1..0..0....0..1..1..1....1..0..1..1....1..0..1..1....0..1..1..0
%e A208424 ..1..0..1..1....1..0..1..0....0..1..0..0....0..1..0..1....1..1..0..1
%e A208424 ..1..1..0..0....0..1..1..1....1..0..1..1....1..0..1..0....0..1..1..0
%e A208424 ..1..0..1..1....1..0..1..0....0..1..0..0....0..1..0..0....0..1..0..0
%e A208424 ..0..1..0..0....0..1..1..1....1..0..1..1....1..0..1..1....1..1..1..1
%e A208424 ..1..0..1..0....1..0..1..0....0..1..0..0....0..1..0..0....0..1..0..0
%K A208424 nonn
%O A208424 1,1
%A A208424 _R. H. Hardin_ Feb 26 2012