cp's OEIS Frontend

A207723 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically.

%I A207723 #9 Dec 27 2023 21:07:09
%S A207723 2,16,78,441,8575,277729,4799749,93547584,8978585264,1701743731081,
%T A207723 92421758243781,5198831216732241,3314060538084914409,
%U A207723 4426079717506620317769,675694617961142291654422
%N A207723 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically.
%C A207723 Diagonal of A207729.
%H A207723 R. H. Hardin, <a href="/A207723/b207723.txt">Table of n, a(n) for n = 1..20</a>
%e A207723 Some solutions for n=4
%e A207723 ..0..1..1..0....0..0..1..1....1..0..1..1....1..1..1..1....1..1..0..0
%e A207723 ..1..1..1..0....0..1..1..1....1..1..0..1....1..1..1..1....1..1..0..1
%e A207723 ..0..1..1..1....1..0..1..1....1..0..0..1....1..1..1..1....1..1..0..0
%e A207723 ..0..1..1..0....0..0..1..1....0..0..1..1....0..1..1..1....0..1..1..0
%Y A207723 Cf. A207729.
%K A207723 nonn
%O A207723 1,1
%A A207723 _R. H. Hardin_, Feb 19 2012