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 #4 Jan 06 2013 19:53:06
%S 8,392,22268,1319409,78633756,4684821704,278802326676,16577412686597,
%T 985111139474492,58519095228020616,3475483474225610814,
%U 206383882956736627050,12254681900155763390448,727625190336114167472388
%N Number of nX5 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2
%C Column 5 of A221255
%H R. H. Hardin, <a href="/A221252/b221252.txt">Table of n, a(n) for n = 1..43</a>
%e Some solutions for n=3
%e ..1..1..1..2..0....0..1..0..2..0....0..2..1..1..0....0..1..1..2..0
%e ..0..1..2..2..0....2..2..1..1..1....1..2..0..2..2....2..2..0..2..0
%e ..1..2..0..1..1....1..1..1..2..0....1..0..1..2..0....0..0..2..2..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 06 2013