|
%I #5 Mar 31 2012 12:35:51
%S 3,21,114,850,5354,40832,274911,2120988,14827787,115207396,825114785,
%T 6441358454,46915800558,367505583063,2710102446879,21283753145043,
%U 158451414945246,1246900992786465,9352863302296454,73719397766360957
%N Number of nX3 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2
%C Column 3 of A183407
%H R. H. Hardin, <a href="/A183404/b183404.txt">Table of n, a(n) for n = 1..46</a>
%e Some solutions for 4X3
%e ..0..0..0....0..0..0....0..0..1....0..0..0....0..0..0....0..1..0....0..0..1
%e ..0..0..0....1..0..0....0..1..0....0..0..1....1..0..1....0..1..0....0..1..0
%e ..0..1..0....0..0..0....0..0..1....1..1..0....0..1..1....0..1..0....0..0..0
%e ..0..1..0....1..1..1....0..0..0....1..1..1....1..0..1....0..0..0....1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 04 2011
| 