%I #4 Mar 08 2013 07:43:01
%S 15,2150,443510,95867967,20978414941,4643150795564,1036481888251762,
%T 232912437941917635,52614561200004212957,11936312777288007185980,
%U 2717468404561524996790251,620503805193057253513443782
%N Number of 4Xn 0..3 arrays with no more than floor(4Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order
%C Row 4 of A222878
%H R. H. Hardin, <a href="/A222881/b222881.txt">Table of n, a(n) for n = 1..16</a>
%e Some solutions for n=3
%e ..0..0..1....0..1..0....0..1..0....0..1..0....0..0..0....0..1..0....0..0..1
%e ..1..2..2....0..2..0....0..1..0....0..2..1....1..2..1....0..2..2....1..2..1
%e ..1..2..1....3..0..3....0..1..2....1..1..3....1..1..2....1..0..1....1..0..0
%e ..3..0..2....1..3..3....3..1..3....0..3..1....3..0..2....3..0..3....1..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 08 2013
|