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A222907 Number of 2 X n 0..3 arrays with no more than floor(2 X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

%I A222907 #6 Jan 22 2022 16:24:06
%S A222907 2,4,7,25,92,403,1710,8021,36160,175685,811796,3996105,18729552,
%T A222907 92602363,438528764,2169839823,10361611742,51246105785,246397237188,
%U A222907 1217744328605,5887982752143,29081428391143,141255777787573,697390129303759
%N A222907 Number of 2 X n 0..3 arrays with no more than floor(2 X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
%C A222907 Row 2 of A222906.
%H A222907 R. H. Hardin, <a href="/A222907/b222907.txt">Table of n, a(n) for n = 1..138</a>
%e A222907 All solutions for n=3
%e A222907 ..0..1..1....0..0..1....0..0..1....0..0..0....0..0..0....0..0..0....0..0..0
%e A222907 ..1..1..1....0..0..0....1..1..1....0..0..1....0..0..0....1..0..0....0..1..1
%Y A222907 Cf. A222906.
%K A222907 nonn
%O A222907 1,1
%A A222907 _R. H. Hardin_, Mar 09 2013