A220802 - OEIS

%I #4 Dec 21 2012 20:01:51

%S 8,48,512,4096,30766,262144,2097152,16728064,134217728,1073741824,

%T 8587150368,68719476736,549755813888,4397962625024,35184372088832,

%U 281474976710656,2251796346117248,18014398509481984,144115188075855872

%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 and vertical neighbors in a random 0..3 nX3 array

%C Column 3 of A220805

%H R. H. Hardin, <a href="/A220802/b220802.txt">Table of n, a(n) for n = 1..146</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 21 2012