A183788 - OEIS

%I #5 Mar 31 2012 12:35:54

%S 72468,15497634,3250564943,685721542209,144396520117972,

%T 30424632455651757,6409207767186189577,1350253009910264801420,

%U 284455606989957949866518,59926376205490175182612148

%N Half the number of (n+1)X6 0..2 arrays with no 2X2 subblock having sum 4

%C Column 5 of A183792

%H R. H. Hardin, <a href="/A183788/b183788.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for 3X6

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 07 2011