login

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

Number of n X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any antidiagonal neighbor (colorings ignoring permutations of colors)
0

%I #6 Dec 18 2015 18:18:04

%S 1,10,9089,3038188519,955922762706415420,

%T 584640904301741699504623887947

%N Number of n X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any antidiagonal neighbor (colorings ignoring permutations of colors)

%C Diagonal of A208788

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 01 2012