A222495 - OEIS

%I #5 Feb 23 2013 07:00:25

%S 0,4,6,95,525,7420,40428,636953,3473192,57944170,307452564,5382036893,

%T 27808882969,505897592674,2555395714322,47885314854974,

%U 237764769206647,4553475954110482,22336733995345136,434447462103135220

%N Number of nX3 0..3 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

%C Column 3 of A222500

%H R. H. Hardin, <a href="/A222495/b222495.txt">Table of n, a(n) for n = 1..206</a>

%e Some solutions for n=4

%e ..0..1..2....0..1..1....0..1..0....0..0..1....0..1..2....0..1..0....0..0..0

%e ..0..1..1....2..1..3....1..1..0....0..0..0....0..0..0....0..1..1....1..0..0

%e ..1..1..1....1..1..1....1..1..1....2..0..0....0..0..0....1..1..1....0..0..0

%e ..1..1..1....1..1..1....1..1..1....0..0..0....0..0..0....1..1..1....2..0..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 23 2013