A184150 - OEIS

%I #5 Mar 31 2012 12:35:56

%S 8544883,23019453235,59956202692285,156962462690881921,

%T 410618317896670998877,1074317319424680321399811,

%U 2810726734347901488302111479,7353703264467632594839577120701

%N 1/4 the number of (n+1)X7 0..3 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically

%C Column 6 of A184153

%H R. H. Hardin, <a href="/A184150/b184150.txt">Table of n, a(n) for n = 1..27</a>

%e Some solutions for 3X7 with a(1,1)=0

%e ..0..0..0..0..1..0..2....0..0..0..0..1..2..0....0..0..0..0..3..0..0

%e ..0..0..0..0..3..0..1....0..0..0..0..3..3..0....0..0..0..0..3..0..0

%e ..0..0..0..0..2..0..1....0..0..0..1..1..1..0....0..0..0..0..2..0..3

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 09 2011