A222694 - OEIS

%I #4 Feb 28 2013 17:08:48

%S 0,216,2050,47696,419562,12765040,126928736,4292369132,46437072442,

%T 1665124000236,18888312086238,693531743163910,8036001935941558,

%U 298077593903645728,3488969551802753323,130077277806080796677

%N Number of 5Xn 0..2 arrays with exactly floor(5Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

%C Row 5 of A222690

%H R. H. Hardin, <a href="/A222694/b222694.txt">Table of n, a(n) for n = 1..31</a>

%e Some solutions for n=3

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 28 2013