A232942 - OEIS

%I #6 Dec 18 2015 18:18:47

%S 1,17,1163,328989,389997789,1950478851269,41313911641960579,

%T 3714942841397823613817,1420295754221243029275852053,

%U 2311198726771295243900465723816785

%N Number of n X n 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 Diagonal of A232948

%H R. H. Hardin, <a href="/A232942/b232942.txt">Table of n, a(n) for n = 1..11</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 02 2013