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A222841 Number of n X 4 0..3 arrays with no more than floor(n X 4/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.

%I A222841 #6 Jun 07 2021 15:04:56
%S A222841 11,1585,326408,70144361,15371324917,3410802057085,763478480305913,
%T A222841 172013012570239087,38951066890039501260,8855947103673731502351,
%U A222841 2020193746874015711217978,462122926444094400382307495
%N A222841 Number of n X 4 0..3 arrays with no more than floor(n X 4/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.
%C A222841 Column 4 of A222842.
%H A222841 R. H. Hardin, <a href="/A222841/b222841.txt">Table of n, a(n) for n = 1..20</a>
%e A222841 Some solutions for n=3
%e A222841 ..0..1..0..2....0..1..0..1....0..1..1..2....0..1..0..2....0..1..0..2
%e A222841 ..2..1..2..1....0..0..2..0....0..0..3..1....2..2..1..0....3..1..2..3
%e A222841 ..1..0..3..3....1..1..3..1....2..1..0..2....1..2..2..0....1..3..1..2
%Y A222841 Cf. A222842.
%K A222841 nonn
%O A222841 1,1
%A A222841 _R. H. Hardin_ Mar 06 2013