A265453 - OEIS

%I #4 Dec 09 2015 09:58:28

%S 12,250,7422,216466,6056182,161435322,4148236142,103476193518,

%T 2523840866186,60444664118334,1426665304637082,33267668122964462,

%U 768000220549574982,17579038730691587714,399459371232734669014

%N Number of nX3 0..n+3-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.

%C Column 3 of A265458.

%H R. H. Hardin, <a href="/A265453/b265453.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

%e ..3..2..0....1..2..0....4..2..0....1..3..1....0..2..3....2..3..2....3..1..0

%e ..1..0..2....0..1..2....2..3..1....2..4..3....2..0..1....0..2..3....2..3..1

%e ..2..1..3....1..2..4....3..1..0....4..3..4....3..2..3....1..0..1....3..4..2

%Y Cf. A265458.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 09 2015