A202744 - OEIS

%I #7 Mar 31 2012 12:36:51

%S 2,8,38,140,638,3032,14258,70136,350594,1767452,9029918,46519544,

%T 241210598,1258499756,6598909298,34748813672,183679125026,

%U 974136322892,5181534476414,27634187724392,147730324961126,791463055043228

%N Number of 3Xn 0..1 arrays with row sums equal and column sums unequal to adjacent columns

%C Row 3 of A202742

%H R. H. Hardin, <a href="/A202744/b202744.txt">Table of n, a(n) for n = 1..50</a>

%e Some solutions for n=5

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 23 2011