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A209589 Number of n X n 0..4 arrays with every element equal to a diagonal or antidiagonal reflection 1

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

%S 5,625,140625,791015625,8009033203125,2027286529541015625,

%T 923682425022125244140625,10521320122517645359039306640625,

%U 215719941636994597502052783966064453125

%N Number of n X n 0..4 arrays with every element equal to a diagonal or antidiagonal reflection

%C Column 4 of A209593

%H R. H. Hardin, <a href="/A209589/b209589.txt">Table of n, a(n) for n = 1..30</a>

%F a(n) = 5 ^ (2*n-(n modulo 2)) * 45 ^ ((n*n-2*n+(n modulo 2))/4)

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 10 2012

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Last modified July 21 18:17 EDT 2024. Contains 374475 sequences. (Running on oeis4.)