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%I #4 Jan 21 2013 07:59:05
%S 1,176,3575,64828,1045365,16774856,268423663,4294961836,68719443799,
%T 1099511617328,17592185966917,281474976692892,4503599627209009,
%U 72057594037900088,1152921504606539891,18446744073709510476
%N Equals one maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 4Xn array
%C Row 4 of A221632
%H R. H. Hardin, <a href="/A221635/b221635.txt">Table of n, a(n) for n = 1..20</a>
%e Some solutions for n=3
%e ..0..0..0....0..0..1....0..1..0....1..0..1....1..0..1....0..1..0....1..1..0
%e ..0..1..0....1..1..1....1..0..0....0..1..0....1..1..0....1..1..1....0..0..0
%e ..1..1..0....0..0..1....1..0..1....1..1..1....0..1..1....1..0..1....1..0..1
%e ..0..0..1....0..1..1....1..1..1....1..0..1....0..1..1....1..1..1....0..1..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 21 2013
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