A207922 - OEIS

%I #5 Mar 31 2012 12:37:20

%S 42,1764,12994,101069,628945,4105063,28188778,187980955,1245595210,

%T 8342244698,55794408879,372138707621,2485175186365,16603501309984,

%U 110873077840653,740391497518318,4944900311857882,33024243581797845

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

%C Row 7 of A207918

%H R. H. Hardin, <a href="/A207922/b207922.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..1..0..0..1....1..0..0..1....0..1..0..0....0..1..1..0....0..1..0..0

%e ..0..1..1..0....1..0..0..1....1..1..1..0....0..0..1..0....0..0..1..0

%e ..0..1..1..0....0..0..1..1....1..1..1..1....0..0..1..1....0..0..1..0

%e ..1..1..1..1....0..1..1..0....1..0..0..1....1..0..0..1....1..0..0..1

%e ..1..0..0..1....0..1..0..0....1..0..0..1....1..1..0..0....1..0..0..1

%e ..1..0..0..1....1..0..0..1....0..0..1..0....0..1..1..0....1..0..0..1

%e ..1..1..1..0....1..0..0..1....0..0..1..0....0..1..1..0....1..0..0..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 21 2012