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%I #4 Dec 15 2012 20:20:56
%S 8,176,3778,64968,1047584,16776012,268433898,4294965416,68719474278,
%T 1099511624848,17592186040838,281474976706320,4503599627365360,
%U 72057594037922000,1152921504606840240,18446744073709544080
%N Equals one maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and vertical neighbors in a random 0..2 nX4 array
%C Column 4 of A220545
%H R. H. Hardin, <a href="/A220544/b220544.txt">Table of n, a(n) for n = 1..20</a>
%e Some solutions for n=3
%e ..1..0..0..1....1..1..1..1....1..0..0..0....1..1..1..1....0..0..0..0
%e ..0..1..0..1....1..0..1..0....0..1..0..1....0..0..0..0....1..0..0..1
%e ..1..0..1..1....1..1..0..1....0..1..0..0....1..0..0..0....0..0..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 15 2012
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