A209588 - OEIS

%I #6 Dec 18 2015 18:18:05

%S 4,256,28672,51380224,161128382464,8084777718513664,

%T 709908161907247808512,997369854092025849117147136,

%U 2452157460147152961259796760100864

%N Number of n X n 0..3 arrays with every element equal to a diagonal or antidiagonal reflection

%C Column 3 of A209593

%H R. H. Hardin, <a href="/A209588/b209588.txt">Table of n, a(n) for n = 1..30</a>

%F a(n) = 4 ^ (2*n-(n modulo 2)) * 28 ^ ((n*n-2*n+(n modulo 2))/4)

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 10 2012