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A222675 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

%I A222675 #6 Jul 23 2025 02:54:36
%S A222675 4,10,58,527,8276,133028,2363628,40206464,727306856,12525102179,
%T A222675 225526086320,3916711645116,70238669794180,1227292294581568,
%U A222675 21942415435228510,385251466640023275,6872913615981792520
%N A222675 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
%C A222675 Column 4 of A222679
%H A222675 R. H. Hardin, <a href="/A222675/b222675.txt">Table of n, a(n) for n = 1..87</a>
%e A222675 Some solutions for n=3
%e A222675 ..0..0..0..0....0..1..1..1....0..0..0..1....0..0..1..2....0..0..0..0
%e A222675 ..0..0..0..0....0..1..1..1....0..0..0..1....0..0..0..0....0..0..0..0
%e A222675 ..1..1..0..0....2..1..1..1....0..0..0..2....0..0..0..0....0..0..1..2
%K A222675 nonn
%O A222675 1,1
%A A222675 _R. H. Hardin_ Feb 28 2013