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A222568 Number of nX3 0..2 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

%I A222568 #6 Jul 23 2025 02:46:26
%S A222568 1,5,11,120,500,5210,20889,229894,913405,10427244,40896923,479942958,
%T A222568 1866795781,22316526370,86377362833,1045093746614,4036724271985,
%U A222568 49216523120074,190041618262033,2328483132653366,8997015510376997
%N A222568 Number of nX3 0..2 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.
%C A222568 Column 3 of A222573
%H A222568 R. H. Hardin, <a href="/A222568/b222568.txt">Table of n, a(n) for n = 1..210</a>
%e A222568 Some solutions for n=3
%e A222568 ..0..1..0....0..0..0....0..1..1....0..1..2....0..0..0....0..0..1....0..0..0
%e A222568 ..1..1..1....0..0..0....1..1..1....1..1..1....0..0..1....0..0..0....1..0..0
%e A222568 ..1..1..1....0..0..0....1..1..1....1..1..1....0..0..0....0..0..0....0..0..0
%K A222568 nonn
%O A222568 1,2
%A A222568 _R. H. Hardin_ Feb 25 2013