cp's OEIS Frontend

A189189 Number of n X n binary arrays without the pattern 0 0 1 vertically or antidiagonally.

%I A189189 #9 Jul 22 2025 11:36:18
%S A189189 2,16,316,15326,1579664,367115337,184841938568,209311662962608,
%T A189189 525679279319545840,2979655033608039508606,37875187935027408625277140,
%U A189189 1087648851912447148168100296827,70353152136567154798416885107484140
%N A189189 Number of n X n binary arrays without the pattern 0 0 1 vertically or antidiagonally.
%C A189189 Diagonal of A189196
%H A189189 R. H. Hardin, <a href="/A189189/b189189.txt">Table of n, a(n) for n = 1..20</a>
%e A189189 Some solutions for 3X3
%e A189189 ..1..1..1....0..0..0....1..1..0....0..0..1....1..0..1....1..1..1....0..1..0
%e A189189 ..0..1..1....1..1..0....1..1..1....1..1..0....0..1..0....0..0..0....1..0..0
%e A189189 ..1..0..0....1..0..0....1..1..1....1..1..1....1..1..0....1..0..0....0..1..0
%K A189189 nonn
%O A189189 1,1
%A A189189 _R. H. Hardin_ Apr 18 2011