[go: up one dir, main page]

login

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”).

Number of nX5 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with every occupancy equal to zero or two
0

%I #3 Jan 09 2013 16:37:22

%S 0,90,0,38146,0,19642342,0,9842336697,0,4907450696408,0,

%T 2441328266555768,0,1213489893520857350,0,602992641919618581949,0,

%U 299597420150822374508346,0,148848899893861061853934856,0

%N Number of nX5 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with every occupancy equal to zero or two

%C Column 5 of A221308

%e Some solutions for n=4

%e ..0..0..0..2..2....0..2..0..0..0....0..0..2..0..0....2..2..0..2..0

%e ..2..2..0..0..0....0..2..0..2..0....2..2..2..2..0....0..0..0..2..2

%e ..0..0..2..2..0....2..2..2..2..0....0..0..0..2..2....0..0..0..0..2

%e ..2..2..2..2..0....0..2..0..2..2....0..2..2..0..2....2..2..2..2..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 09 2013