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 #6 Dec 18 2015 18:18:40
%S 3,38,1610,222990,104382552,162794962814,851668326534130,
%T 14897378230939391994,872764112558460116016396,
%U 171094770747292212524499798502,112292092887713869652391305250607824
%N Number of n X n 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 antidiagonally
%C Diagonal of A229372
%H R. H. Hardin, <a href="/A229365/b229365.txt">Table of n, a(n) for n = 1..13</a>
%e Some solutions for n=3
%e ..1..2..2....2..2..2....1..0..0....0..2..0....0..1..2....0..1..0....0..1..0
%e ..1..0..0....0..0..1....2..1..2....0..1..0....1..0..1....0..2..1....0..1..0
%e ..1..2..1....1..0..2....1..2..1....2..2..0....1..0..0....2..0..1....0..2..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Sep 21 2013