A208782 - OEIS

A208782

Number of nX2 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)

%I #5 Mar 31 2012 12:37:24

%S 2,10,114,2066,52922,1788850,76282138,3974779402,247083681522,

%T 17984917069018,1510073008031682,144466325466945282,

%U 15586227681748183978,1879836370194918728834,251554605154723467929962

%N Number of nX2 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 Column 2 of A208788

%H R. H. Hardin, <a href="/A208782/b208782.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 01 2012