A202743 - OEIS

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

%S 2,2,6,22,54,102,214,582,1590,3814,8662,20934,53942,137190,335574,

%T 815942,2032694,5139942,12902614,32059846,79807158,200325350,

%U 504502230,1267146054,3176193590,7975495910,20082938838,50611676614,127466481334

%N Number of 2Xn 0..1 arrays with row sums equal and column sums unequal to adjacent columns

%C Row 2 of A202742

%H R. H. Hardin, <a href="/A202743/b202743.txt">Table of n, a(n) for n = 1..168</a>

%e Some solutions for n=5

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 23 2011