A220403 - OEIS

%I #5 Dec 13 2012 17:41:33

%S 2,17,122,720,4304,25391,150079,884793,5205467,30603312,179828144,

%T 1056663902,6208358851,36476199327,214305557200,1259086948475,

%U 7397361356851,43460791661461,255339657788151,1500164308002762

%N Equals two maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 nX3 array

%C Column 3 of A220406

%H R. H. Hardin, <a href="/A220403/b220403.txt">Table of n, a(n) for n = 1..136</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 13 2012