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A252207 Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 1 3 4 6 or 7 1

%I #4 Dec 15 2014 08:26:07

%S 51024,215814,2908856,11207238,193004794,2778728210,10519316686,

%T 185237248134,2757905885304,10320806426406,183760175803834,

%U 2783001368929202,10347503929104718,185246818559668614

%N Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 1 3 4 6 or 7

%C Column 5 of A252210

%H R. H. Hardin, <a href="/A252207/b252207.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 1804*a(n-3) -939039*a(n-6) +145283316*a(n-9) -1639033824*a(n-12) +4149682176*a(n-15) +1639972864*a(n-18) -4294967296*a(n-21) for n>24

%e Some solutions for n=1

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 15 2014

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Last modified April 23 14:49 EDT 2024. Contains 371914 sequences. (Running on oeis4.)