A232947 - OEIS

%I #4 Dec 02 2013 18:31:52

%S 729,114243,22471303,4586348177,950054488141,197901829874065,

%T 41313911641960579,8631911498064803251,1804078633382571536609,

%U 377098877333784048574025,78826795850335605854348539

%N Number of nX7 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically or antidiagonally, and top left element zero

%C Column 7 of A232948

%H R. H. Hardin, <a href="/A232947/b232947.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=2

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 02 2013