A228979 - OEIS

A228979

Number of n X n 0..1 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1)X(n+1) 0..1 array.

%I #9 Dec 18 2015 18:18:39

%S 2,16,512,56472,20729216,25205141664,102496979446048,

%T 1399175578116323192,64226272780209688718776

%N Number of n X n 0..1 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1)X(n+1) 0..1 array.

%C Diagonal of A228986.

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Sep 10 2013