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A222583 Number of nX3 0..2 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.

%I A222583 #7 Jul 23 2025 02:47:43
%S A222583 1,5,9,112,426,4790,18007,208768,783389,9222742,34725955,412489970,
%T A222583 1558983053,18631988604,70660866011,848302913944,3226795572945,
%U A222583 38872008280152,148241838020273,1790674769103638,6843805534505557
%N A222583 Number of nX3 0..2 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.
%C A222583 Column 3 of A222587
%H A222583 R. H. Hardin, <a href="/A222583/b222583.txt">Table of n, a(n) for n = 1..202</a>
%e A222583 Some solutions for n=3
%e A222583 ..0..0..0....0..0..0....0..1..1....0..0..0....0..0..0....0..0..0....0..0..0
%e A222583 ..0..0..1....0..0..0....1..1..1....0..0..0....0..0..0....0..0..0....1..0..0
%e A222583 ..0..0..0....0..0..0....1..1..1....0..0..1....0..1..0....1..0..0....0..0..0
%K A222583 nonn
%O A222583 1,2
%A A222583 _R. H. Hardin_ Feb 25 2013