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”).

Equals two maps: number of nX5 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 nX5 array
0

%I #3 Dec 13 2012 17:42:12

%S 7,93,6013,128448,2996186,74035199

%N Equals two maps: number of nX5 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 nX5 array

%C Column 5 of A220406

%e Some solutions for n=3

%e ..0..0..1..0..0....0..0..0..0..1....1..0..1..0..1....0..1..0..1..0

%e ..0..0..1..1..0....0..1..0..0..0....0..0..0..0..0....0..1..0..1..1

%e ..0..0..0..0..0....0..1..0..1..0....1..1..1..0..0....0..1..1..1..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 13 2012