A208683 - OEIS

%I #9 May 04 2021 15:41:32

%S 2,16,78,927,12096,301035,6398617,358035204,14996975204,1866358422700,

%T 142488171799491,43994512655386488,5996882020078059149,

%U 4716359423241404452425,1123534623785504112746542

%N Number of n X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 1 and 1 0 1 vertically.

%C Diagonal of A208688.

%H R. H. Hardin, <a href="/A208683/b208683.txt">Table of n, a(n) for n = 1..37</a>

%e Some solutions for n=4

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

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

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

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

%Y Cf. A208688.

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 01 2012