cp's OEIS Frontend

A188867 Number of n X n binary arrays without the pattern 0 0 0 antidiagonally or horizontally.

%I A188867 #9 Jul 22 2025 11:26:07
%S A188867 2,16,316,21937,4805140,3043939392,6231989402196,39466951597153578,
%T A188867 765738615267315132042,46457365071065953602984688,
%U A188867 8729291812408997804314294504336,5077761520250192263227063403337912870
%N A188867 Number of n X n binary arrays without the pattern 0 0 0 antidiagonally or horizontally.
%C A188867 Diagonal of A188874
%H A188867 R. H. Hardin, <a href="/A188867/b188867.txt">Table of n, a(n) for n = 1..18</a>
%e A188867 Some solutions for 3X3
%e A188867 ..1..0..1....0..1..0....0..0..1....0..0..1....0..1..0....1..1..1....1..0..1
%e A188867 ..1..1..0....1..0..1....1..1..0....0..1..1....0..1..0....1..0..0....1..1..0
%e A188867 ..0..1..0....1..1..0....1..0..0....1..0..0....0..1..1....1..1..1....1..0..0
%K A188867 nonn
%O A188867 1,1
%A A188867 _R. H. Hardin_ Apr 12 2011