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A252208 Number of (n+2)X(6+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 08:26:50

%S 125554,932474,22430534,84935426,2778728210,78534150994,267361717782,

%T 9906342079298,303070072293522,959873651074130,38221223204833202,

%U 1212189579390626626,3685070395096108374,152413070389286672834

%N Number of (n+2)X(6+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 6 of A252210

%H R. H. Hardin, <a href="/A252208/b252208.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 7180*a(n-3) -14766111*a(n-6) +8766317556*a(n-9) -103534211040*a(n-12) +266111582208*a(n-15) +103548977152*a(n-18) -274877906944*a(n-21) for n>24

%e Some solutions for n=1

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 15 2014

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)