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A252308 Number of (3+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 1 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 1 3 6 or 7 1

%I

%S 1303,1168,1677,2287,3902,6103,8650,14935,23660,33855,58675,93344,

%T 134047,232723,370928,533559,927091,1478960,2129095,3700915,5906480,

%U 8506215,14788915,23607344,34004647,59126323,94392368,135978279,236446771

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

%C Row 3 of A252305

%H R. H. Hardin, <a href="/A252308/b252308.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 7*a(n-3) -14*a(n-6) +8*a(n-9) for n>15

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 16 2014

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Last modified October 18 07:42 EDT 2019. Contains 328146 sequences. (Running on oeis4.)