Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #9 Nov 22 2013 09:50:26
%S 2,24,1202,231454,161243887,400571676322,3587649343841650,
%T 115662789623304964655,13420410026776778616974635,
%U 5604396268950285334109397116334,8423557107575828118320152665611119144
%N Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal or antidiagonal neighbor, with top left element zero
%C Diagonal of A232316
%H R. H. Hardin, <a href="/A232310/b232310.txt">Table of n, a(n) for n = 1..15</a>
%e Some.solutions.for.n=3
%e ..0..0..1..1....0..0..1..0....0..0..1..1....0..0..0..1....0..0..0..1
%e ..0..1..1..1....1..1..0..1....0..1..1..0....0..0..1..0....0..0..1..1
%e ..1..0..1..1....0..0..1..1....1..0..0..1....0..1..0..1....0..1..1..1
%e ..0..0..0..0....1..1..0..0....1..1..1..1....0..0..1..1....1..1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 22 2013