A186936 - OEIS

%I #5 Mar 31 2012 12:36:06

%S 1000,27272,241320,2504264,25314744,264604776,2731872328,28477050608,

%T 295182600552,3063267862112,31785328427832,329995464895168,

%U 3425533459997032,35554512231460224,369074247549339088

%N Number of (n+1)X7 binary arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

%C Column 6 of A186939

%H R. H. Hardin, <a href="/A186936/b186936.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for 4X7

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 01 2011