|
%I #4 Dec 13 2012 06:48:33
%S 2,23,236,2095,18296,154562,1280878,10492879,85253117,688997802,
%T 5548695509,44580367227,357622113010,2865892548630,22950987106487,
%U 183716756194773,1470171909243331,11762592622678971,94098427741015878
%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..2 nX3 array
%C Column 3 of A220375
%H R. H. Hardin, <a href="/A220373/b220373.txt">Table of n, a(n) for n = 1..48</a>
%e Some solutions for n=3
%e ..1..1..0....1..1..0....1..0..1....1..1..0....0..1..1....1..0..0....0..1..1
%e ..1..1..1....1..1..0....0..0..1....1..0..0....0..0..1....0..1..1....1..0..1
%e ..0..0..1....0..0..0....1..1..0....0..0..0....1..0..0....0..0..1....1..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 13 2012
| 