A222446 - OEIS

%I #4 Feb 20 2013 16:09:47

%S 8,64,420,4056,32720,262104,2082688,16777216,134217728,1073741824,

%T 8588539008,68719476736,549755813888,4398046511104,35184256942080,

%U 281474976587776,2251799813537792,18014398509359104,144115179143299072

%N Sum of neighbor maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX3 array

%C Column 3 of A222448

%H R. H. Hardin, <a href="/A222446/b222446.txt">Table of n, a(n) for n = 1..188</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 20 2013