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 #5 Oct 04 2013 05:42:10
%S 3,19,115,739,4679,29569,187211,1185283,7502685,47491531,300627179,
%T 1902998895,12046125511,76252939087,482687382245,3055450450511,
%U 19341249601691,122431683941789,775002524638781,4905829047952315
%N Number of nX2 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j)
%C Column 2 of A229934
%H R. H. Hardin, <a href="/A229928/b229928.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 6*a(n-1) -3*a(n-2) +32*a(n-3) -a(n-4) +7*a(n-5) +43*a(n-6) +47*a(n-7) +7*a(n-8) +26*a(n-9) -13*a(n-10) +6*a(n-11) -5*a(n-12) +a(n-13)
%e Some solutions for n=3
%e ..2..0....1..1....2..0....2..0....2..2....0..2....1..0....2..0....2..0....2..0
%e ..2..1....0..1....0..0....2..2....0..2....1..0....1..2....2..0....0..2....1..1
%e ..0..1....2..0....0..2....0..2....1..1....1..2....0..2....2..0....0..2....2..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Oct 04 2013