|
%I #4 Dec 08 2012 13:31:43
%S 2,23,148,1131,8127,58091,419164,3016838,21697096,156223103,
%T 1124229264,8090787596,58233550828,419095508303,3016219087452,
%U 21707952324961,156230959713801,1124391382315226,8092241949528463,58239664959701115
%N Equals two maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..1 nX3 array
%C Column 3 of A220242
%H R. H. Hardin, <a href="/A220239/b220239.txt">Table of n, a(n) for n = 1..23</a>
%e Some solutions for n=3
%e ..1..0..0....0..1..0....0..0..0....1..1..0....0..1..0....0..1..0....0..0..1
%e ..1..0..0....1..1..0....0..0..1....0..1..1....0..0..1....1..1..0....0..0..0
%e ..0..1..0....0..0..0....0..1..1....0..0..1....0..0..1....0..0..1....1..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 08 2012
| 