login

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

Number of n X n symmetric 0..4 arrays with no element equal to the sum mod 5 of any two of its horizontal and vertical neighbors
0

%I #5 Dec 18 2015 18:17:41

%S 5,64,1212,46984,3644772,576095092,189451753044,131372808313824,

%T 193374015990002468

%N Number of n X n symmetric 0..4 arrays with no element equal to the sum mod 5 of any two of its horizontal and vertical neighbors

%e Some solutions for 4X4

%e ..4..1..4..1....3..0..1..0....3..0..3..4....2..0..4..3....0..1..0..2

%e ..1..4..4..3....0..1..4..1....0..3..0..3....0..2..3..0....1..0..2..3

%e ..4..4..4..1....1..4..4..3....3..0..1..2....4..3..0..3....0..2..0..2

%e ..1..3..1..1....0..1..3..0....4..3..2..3....3..0..3..4....2..3..2..3

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 18 2011