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A252122 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 3 4 6 or 7 1

%I #5 Dec 14 2014 10:37:42

%S 380,1732,25017,106631,4795018,515273273,2318294384,811073548890,

%T 638092781836452,2811163183497319,7197579550558730338,

%U 39177279320409985651205,173573852999518870312297

%N Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 3 4 6 or 7

%C Diagonal of A252130

%H R. H. Hardin, <a href="/A252122/b252122.txt">Table of n, a(n) for n = 1..14</a>

%e Some solutions for n=4

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 14 2014

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Last modified May 19 07:05 EDT 2024. Contains 372666 sequences. (Running on oeis4.)