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A222504 Number of nX3 0..1 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

%I A222504 #7 Jul 23 2025 02:41:06
%S A222504 0,4,4,35,87,496,1335,7552,21382,122942,348597,2045395,5812073,
%T A222504 34558802,98272393,589386556,1678849694,10123122248,28893573238,
%U A222504 174842616458,500084523708,3033764103592,8694157659203,52844583851218,151707321284408
%N A222504 Number of nX3 0..1 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order.
%C A222504 Column 3 of A222509
%H A222504 R. H. Hardin, <a href="/A222504/b222504.txt">Table of n, a(n) for n = 1..210</a>
%e A222504 All solutions for n=3
%e A222504 ..0..0..0....0..0..0....0..0..0....0..1..0
%e A222504 ..0..0..1....0..0..0....1..0..0....1..1..1
%e A222504 ..0..0..0....1..0..1....0..0..0....1..1..1
%K A222504 nonn
%O A222504 1,2
%A A222504 _R. H. Hardin_ Feb 23 2013