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%I #4 Feb 18 2013 05:37:39
%S 8,64,512,3968,32768,262144,2093824,16776064,134121152,1073741824,
%T 8589934592,68719450112,549755703296,4398040219648,35184371580928,
%U 281474867658752,2251799813685248,18014398509481984,144115184855048192
%N Sum of neighbor maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal and antidiagonal neighbors in a random 0..2 3Xn array
%C Row 3 of A222386
%H R. H. Hardin, <a href="/A222388/b222388.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=3
%e ..0..0..1....0..0..0....1..0..0....1..1..1....0..0..0....1..0..1....1..0..0
%e ..1..1..0....1..1..1....1..1..1....0..0..0....1..0..0....0..1..0....1..1..1
%e ..1..1..1....1..0..1....1..1..0....0..1..0....1..0..0....1..0..0....0..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 18 2013
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