A222483 - OEIS

%I #5 Feb 22 2013 07:57:56

%S 0,4,6,85,365,3696,14928,159062,645704,7158232,28604092,328610072,

%T 1296477288,15279837312,59712212872,716028671796,2782912936084,

%U 33742870102928,130808705085792,1597212351282064,6187399238975776

%N Number of nX3 0..2 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..2 order

%C Column 3 of A222488

%H R. H. Hardin, <a href="/A222483/b222483.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 22 2013