|
%I #5 Dec 18 2015 18:17:40
%S 2,8,64,1024,27243,1382864,140750620,28217901400,10950671730896,
%T 8078548919508508,11458732300832773022
%N Number of n X n symmetric binary matrices with each 1 adjacent to no more than 5 knight-move neighboring 1s
%e Some solutions for n=6
%e ..0..1..0..1..0..1....0..1..0..0..1..0....0..0..0..0..1..1....0..1..0..1..1..0
%e ..1..0..0..1..0..0....1..0..0..0..0..1....0..0..0..0..0..1....1..0..0..0..0..0
%e ..0..0..0..1..0..1....0..0..0..1..0..0....0..0..1..0..0..1....0..0..0..0..0..0
%e ..1..1..1..0..0..1....0..0..1..1..0..0....0..0..0..1..1..0....1..0..0..1..0..0
%e ..0..0..0..0..0..0....1..0..0..0..1..0....1..0..0..1..1..1....1..0..0..0..1..0
%e ..1..0..1..1..0..1....0..1..0..0..0..0....1..1..1..0..1..1....0..0..0..0..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jun 06 2011
| 