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A222372 Number of nX1 0..3 arrays with no more than floor(nX1/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.

%I A222372 #7 Jul 23 2025 02:32:31
%S A222372 1,1,1,4,5,14,17,75,95,411,519,2522,3211,15919,20299,103627,132515,
%T A222372 683480,875491,4554799,5844093,30542304,39239961,205785953,264702489,
%U A222372 1391485044,1791699029,9436529666,12161620195,64150640719,82742154707
%N A222372 Number of nX1 0..3 arrays with no more than floor(nX1/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.
%C A222372 Column 1 of A222378
%H A222372 R. H. Hardin, <a href="/A222372/b222372.txt">Table of n, a(n) for n = 1..210</a>
%e A222372 All solutions for n=4
%e A222372 ..0....0....0....0
%e A222372 ..0....0....1....0
%e A222372 ..1....0....1....0
%e A222372 ..1....0....1....1
%K A222372 nonn
%O A222372 1,4
%A A222372 _R. H. Hardin_ Feb 17 2013