A203607 - OEIS

%I #5 Mar 31 2012 12:36:57

%S 2,116,4374,129656,3648810,98676048,2608783126,67877862300,

%T 1746486947416,44565435574244,1129996780198844,28510044909875480,

%U 716454082168853988,17946032127185388064,448311886163282442606,11174089403833286592436

%N Number of nX5 0,1 arrays with adjacent row and column sums unequal

%C Column 5 of A203610

%H R. H. Hardin, <a href="/A203607/b203607.txt">Table of n, a(n) for n = 1..18</a>

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 03 2012