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A222901 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

%I A222901 #6 Jul 23 2025 03:14:00
%S A222901 1,7,45,767,4909,119393,759891,20299463,130579169,3588643955,
%T A222901 23230932391,647426033879,4209052934053,118324983126455,
%U A222901 771976078016995,21829828686370139,142850851773130033,4056660324820606967
%N A222901 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
%C A222901 Column 3 of A222906
%H A222901 R. H. Hardin, <a href="/A222901/b222901.txt">Table of n, a(n) for n = 1..210</a>
%e A222901 Some solutions for n=3
%e A222901 ..0..1..0....0..0..0....0..1..1....0..0..1....0..0..0....0..0..1....0..0..1
%e A222901 ..0..0..0....0..0..0....1..1..1....2..0..0....0..0..0....2..2..2....0..0..0
%e A222901 ..0..0..0....0..0..0....1..1..1....0..0..0....0..1..1....2..2..2....0..0..0
%K A222901 nonn
%O A222901 1,2
%A A222901 _R. H. Hardin_ Mar 09 2013