cp's OEIS Frontend

A208415 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically.

%I A208415 #9 Jul 22 2025 21:20:38
%S A208415 2,16,102,1269,18395,365094,8948825,295643872,11569038318,
%T A208415 627185978622,39743547264799,3541122637275087,367535911624122068,
%U A208415 55280614681310159979,9428817551220326025746,2476044134980962346444356
%N A208415 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically.
%C A208415 Diagonal of A208420
%H A208415 R. H. Hardin, <a href="/A208415/b208415.txt">Table of n, a(n) for n = 1..22</a>
%e A208415 Some solutions for n=4
%e A208415 ..0..1..1..0....0..1..1..0....1..1..0..0....1..0..1..0....1..1..0..0
%e A208415 ..0..1..1..1....0..1..0..1....1..0..1..0....0..1..1..1....1..1..1..0
%e A208415 ..1..1..0..0....1..0..1..0....1..1..0..1....1..0..1..0....0..1..0..1
%e A208415 ..0..1..0..1....0..1..0..1....1..0..1..0....0..1..0..1....1..1..1..0
%K A208415 nonn
%O A208415 1,1
%A A208415 _R. H. Hardin_ Feb 26 2012