A203604 - OEIS

%I #6 Mar 31 2012 12:36:57

%S 2,8,20,44,116,332,900,2268,5716,14892,39268,101820,260532,668300,

%T 1727812,4469404,11506196,29540332,75933220,195497084,503093108,

%U 1292802636,3320226820,8530094940,21919963604,56309625260,144586811108

%N Number of nX2 0,1 arrays with adjacent row and column sums unequal

%C Column 2 of A203610

%H R. H. Hardin, <a href="/A203604/b203604.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 03 2012