login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Number of n X n 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero
0

%I #5 Dec 18 2015 18:18:44

%S 0,2,38,802,30304,2121666,271505344,63341237848,26993178279216

%N Number of n X n 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero

%C Diagonal of A230910

%e Some solutions for n=4

%e ..0..2..0..3....0..3..1..3....0..2..1..3....0..1..2..1....0..1..0..1

%e ..1..3..1..0....1..2..0..1....1..3..0..1....3..0..3..0....2..3..2..0

%e ..0..2..3..2....3..1..3..2....2..1..2..0....1..2..1..2....0..1..3..2

%e ..1..0..1..0....0..2..1..0....0..3..1..3....3..0..3..1....3..2..1..0

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 01 2013