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A252014 Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum 1 3 6 or 8 and every diagonal and antidiagonal sum not 1 3 6 or 8 1

%I

%S 3246,6562,14450,29954,104034,303906,630978,2189170,6377986,13220098,

%T 45964930,133947666,277662018,965273490,2812900946,5830902338,

%U 20270743250,59070919826,122448949058,425685608210,1240489316306

%N Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum 1 3 6 or 8 and every diagonal and antidiagonal sum not 1 3 6 or 8

%C Column 7 of A252015

%H R. H. Hardin, <a href="/A252014/b252014.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = a(n-1) +21*a(n-3) -21*a(n-4) for n>15

%e Some solutions for n=4

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

%e ..2..2..2..2..2..2..2..2..2....2..2..2..2..2..2..2..2..2

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

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

%e ..2..2..2..2..2..2..2..2..2....2..2..2..2..2..2..2..2..2

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 12 2014

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Last modified January 25 16:01 EST 2022. Contains 350572 sequences. (Running on oeis4.)